{
  "meta": {
    "disclaimer": "Do not rely on openFDA to make decisions regarding medical care. While we make every effort to ensure that data is accurate, you should assume all results are unvalidated. We may limit or otherwise restrict your access to the API in line with our Terms of Service.",
    "terms": "https://open.fda.gov/terms/",
    "license": "https://open.fda.gov/license/",
    "last_updated": "2025-09-19",
    "results": {
      "skip": 0,
      "limit": 1,
      "total": 1
    }
  },
  "results": [
    {
      "codes": [
        {
          "uuid": "7ce981c2-52a6-4fc9-a137-26e419adcfbb",
          "code": "CYCLOPENTANONE",
          "comments": "JECFA|FUNCTIONAL CLASSIFICATION|Flavouring Agent",
          "type": "PRIMARY",
          "url": "http://apps.who.int/food-additives-contaminants-jecfa-database/chemical.aspx?chemID=4635",
          "code_system": "JECFA EVALUATION",
          "references": [
            "87c32626-2e9b-4360-87c7-f86350244903"
          ]
        },
        {
          "uuid": "b21c851c-8ca5-44fb-abe8-e87b1801b1c8",
          "code": "120-92-3",
          "type": "PRIMARY",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=120-92-3",
          "code_system": "CAS",
          "references": [
            "87c32626-2e9b-4360-87c7-f86350244903",
            "7d9fd72c-97f7-4e1a-9e64-dc5d89f83e4e"
          ]
        },
        {
          "uuid": "6533f907-0dff-401f-849f-0a77f6f41907",
          "code": "C007201",
          "type": "PRIMARY",
          "url": "http://www.ncbi.nlm.nih.gov/mesh/67007201",
          "code_system": "MESH",
          "references": [
            "87c32626-2e9b-4360-87c7-f86350244903"
          ]
        },
        {
          "uuid": "821c770e-53c0-427d-9d78-423760d20bbd",
          "code": "m4008",
          "comments": "Merck Index",
          "type": "PRIMARY",
          "url": "https://merckindex.rsc.org/monographs/m4008?q=authorize",
          "code_system": "MERCK INDEX",
          "references": [
            "87c32626-2e9b-4360-87c7-f86350244903"
          ]
        },
        {
          "uuid": "e7d02a95-1fba-4e10-9c2d-a611e614cc5a",
          "code": "204-435-9",
          "type": "PRIMARY",
          "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.004.033",
          "code_system": "ECHA (EC/EINECS)",
          "references": [
            "87c32626-2e9b-4360-87c7-f86350244903"
          ]
        },
        {
          "uuid": "12434124-c4b3-40f6-9750-f1a4e8545ebd",
          "code": "8452",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/compound/8452",
          "code_system": "PUBCHEM",
          "references": [
            "87c32626-2e9b-4360-87c7-f86350244903"
          ]
        },
        {
          "uuid": "12174418-fd55-dd8b-d9a4-20fab0aeba4a",
          "code": "Cyclopentanone",
          "type": "PRIMARY",
          "url": "https://en.wikipedia.org/wiki/Cyclopentanone",
          "code_system": "WIKIPEDIA",
          "references": [
            "fdff1094-992e-59c1-7004-cd71de9aaf95"
          ]
        },
        {
          "uuid": "765c46e6-c383-7616-200a-5d36fa2c3a94",
          "code": "2822",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/source/hsdb/2822",
          "code_system": "HSDB",
          "references": [
            "6616f169-0119-5ab9-d44f-5b0a8d454cc5"
          ]
        },
        {
          "uuid": "c7d2c90f-b080-6e07-dce4-17f5bb0ab792",
          "code": "DTXSID3029154",
          "type": "PRIMARY",
          "url": "https://comptox.epa.gov/dashboard/chemical/details/DTXSID3029154",
          "code_system": "EPA CompTox",
          "references": [
            "cf2eadda-029c-9d15-844b-e267d4777c1b"
          ]
        },
        {
          "uuid": "f1fe34e9-d09b-457b-8773-0724b1c5b57d",
          "code": "220W81TN3S",
          "type": "PRIMARY",
          "code_system": "FDA UNII"
        },
        {
          "uuid": "f662926c-5989-b88a-de73-4b15051e01f7",
          "code": "16486",
          "type": "PRIMARY",
          "url": "https://www.ebi.ac.uk/chebi/chebiOntology.do?chebiId=CHEBI:16486",
          "code_system": "CHEBI",
          "references": [
            "41c571ff-2dbe-0351-7d33-1deceaee8ef2"
          ]
        },
        {
          "uuid": "85906edf-89f5-8b65-32f5-4d01f1533359",
          "code": "2557363",
          "type": "PRIMARY",
          "url": "https://rxnav.nlm.nih.gov/REST/rxcui/2557363/allProperties.xml?prop=all",
          "code_system": "RXCUI",
          "references": [
            "2f261cc2-1347-3bd4-c10c-2465cae19a9f"
          ]
        },
        {
          "uuid": "bed06c82-f3ac-2b79-22ff-81ef007b596f",
          "code": "4122",
          "type": "PRIMARY",
          "url": "https://dtp.cancer.gov/dtpstandard/servlet/dwindex?searchtype=NSC&outputformat=html&searchlist=4122",
          "code_system": "NSC",
          "references": [
            "611be671-c62d-17c2-f094-42fa7af93687"
          ]
        },
        {
          "uuid": "0f1fd931-7504-d2eb-95f4-5521b73e1df0",
          "code": "220W81TN3S",
          "type": "PRIMARY",
          "url": "https://dailymed.nlm.nih.gov/dailymed/search.cfm?adv=1&query=220W81TN3S",
          "code_system": "DAILYMED",
          "references": [
            "752cfb07-bb7a-4e48-fdb2-d7f6a2af85c6"
          ]
        },
        {
          "uuid": "511b73c4-31cb-21f5-6154-0018ec577ac9",
          "code": "1033",
          "type": "PRIMARY",
          "url": "https://www.fao.org/food/food-safety-quality/scientific-advice/jecfa/jecfa-flav/details/en/c/1033/",
          "code_system": "JECFA MONOGRAPH",
          "references": [
            "eece6080-3152-53ee-067d-b7f7f5f55999"
          ]
        }
      ],
      "substance_class": "chemical",
      "names": [
        {
          "uuid": "816d7bf1-1ae0-4db6-af0b-3d7720c9c0c6",
          "name": "ADIPIC KETONE",
          "stdName": "ADIPIC KETONE",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "67f5d206-3459-478d-ac6b-6d8feec6484c",
            "2035e427-b4c8-4c9f-8175-19c982d59489"
          ],
          "display_name": false
        },
        {
          "uuid": "2740ec40-8a49-4a90-a0e6-98c61121ca12",
          "name": "ADIPIN KETON",
          "stdName": "ADIPIN KETON",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "67f5d206-3459-478d-ac6b-6d8feec6484c",
            "2035e427-b4c8-4c9f-8175-19c982d59489"
          ],
          "display_name": false
        },
        {
          "uuid": "f7951615-7eec-48ad-b4bd-af7b71442e08",
          "name": "CYCLOPENTANONE [FHFI]",
          "stdName": "CYCLOPENTANONE [FHFI]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "626e5835-720d-4d0d-962e-d9d7b6f7f64f",
            "67f5d206-3459-478d-ac6b-6d8feec6484c"
          ],
          "display_name": false
        },
        {
          "uuid": "3a23a83f-a3d5-448c-9f81-1247941ca1f0",
          "name": "CYCLOPENTANONE [HSDB]",
          "stdName": "CYCLOPENTANONE [HSDB]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "6d3fb00a-5a94-4839-a675-6ded5bcc8beb",
            "67f5d206-3459-478d-ac6b-6d8feec6484c"
          ],
          "display_name": false
        },
        {
          "uuid": "76ae033f-7efd-455c-a116-f7c61da1f728",
          "name": "CYCLOPENTANONE [MI]",
          "stdName": "CYCLOPENTANONE [MI]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "a04dbcea-3ec3-4fd9-b5c4-3613c60ae60d",
            "67f5d206-3459-478d-ac6b-6d8feec6484c"
          ],
          "display_name": false
        },
        {
          "uuid": "2ed54181-5da9-4442-b104-5285e8d3e68f",
          "name": "Cyclopentanone",
          "stdName": "CYCLOPENTANONE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "2f0342b8-a09f-4236-a50d-792fd8f37db6",
            "6d3fb00a-5a94-4839-a675-6ded5bcc8beb",
            "93fb7777-c905-45df-8e19-b47c525aba34",
            "a04dbcea-3ec3-4fd9-b5c4-3613c60ae60d",
            "626e5835-720d-4d0d-962e-d9d7b6f7f64f",
            "ba613f17-2759-4917-ae72-8fd5bc936ca2",
            "aa2afe10-15fe-443c-9404-e3afc57c7667",
            "67f5d206-3459-478d-ac6b-6d8feec6484c"
          ],
          "display_name": true
        },
        {
          "uuid": "cdf3e9bd-2279-4393-a0cf-922bd3b9a236",
          "name": "DUMASIN",
          "stdName": "DUMASIN",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "626e5835-720d-4d0d-962e-d9d7b6f7f64f",
            "67f5d206-3459-478d-ac6b-6d8feec6484c"
          ],
          "display_name": false
        },
        {
          "uuid": "52ed96b7-f885-4e76-81d5-868e7299493c",
          "name": "FEMA NO. 3910",
          "stdName": "FEMA NO. 3910",
          "type": "cd",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "626e5835-720d-4d0d-962e-d9d7b6f7f64f",
            "67f5d206-3459-478d-ac6b-6d8feec6484c"
          ],
          "display_name": false
        },
        {
          "uuid": "d5997125-42a3-4606-8624-3a0547bba83d",
          "name": "KETOCYCLOPENTANE",
          "stdName": "KETOCYCLOPENTANE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "67f5d206-3459-478d-ac6b-6d8feec6484c",
            "2035e427-b4c8-4c9f-8175-19c982d59489"
          ],
          "display_name": false
        },
        {
          "uuid": "c06984e2-bed2-4341-a888-4b6cedd6ed37",
          "name": "KETOPENTAMETHYLENE",
          "stdName": "KETOPENTAMETHYLENE",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "626e5835-720d-4d0d-962e-d9d7b6f7f64f",
            "67f5d206-3459-478d-ac6b-6d8feec6484c"
          ],
          "display_name": false
        },
        {
          "uuid": "116fe84f-2fdb-4362-90a3-1462509571d0",
          "name": "NSC-4122",
          "stdName": "NSC-4122",
          "type": "cd",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "fef5af09-3402-4cee-ac4a-9f792cb3f54b",
            "67f5d206-3459-478d-ac6b-6d8feec6484c"
          ],
          "display_name": false
        }
      ],
      "references": [
        {
          "uuid": "93fb7777-c905-45df-8e19-b47c525aba34",
          "citation": "EAFUS",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE",
            "AUTO_SELECTED"
          ]
        },
        {
          "uuid": "67f5d206-3459-478d-ac6b-6d8feec6484c",
          "citation": "EAFUS",
          "doc_type": "EAFUS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "2035e427-b4c8-4c9f-8175-19c982d59489",
          "citation": "stn",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "626e5835-720d-4d0d-962e-d9d7b6f7f64f",
          "citation": "FHFI",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "fef5af09-3402-4cee-ac4a-9f792cb3f54b",
          "citation": "http://www.commonchemistry.org/ChemicalDetail.aspx?ref=120-92-3",
          "url": "http://www.commonchemistry.org/ChemicalDetail.aspx?ref=120-92-3",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "a04dbcea-3ec3-4fd9-b5c4-3613c60ae60d",
          "citation": "MERCK INDEX",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "6d3fb00a-5a94-4839-a675-6ded5bcc8beb",
          "citation": "HSDB",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "87c32626-2e9b-4360-87c7-f86350244903",
          "citation": "SRS CODE IMPORT",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493390922000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "2f9422e6-185c-4c7f-b8a3-783ae9eff0b8",
          "citation": "SRS import [220W81TN3S]",
          "url": "http://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=220W81TN3S",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493390922000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "2f0342b8-a09f-4236-a50d-792fd8f37db6",
          "citation": "CYCLOPENTANONE [FHFI]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "ba613f17-2759-4917-ae72-8fd5bc936ca2",
          "citation": "CYCLOPENTANONE [MI]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "aa2afe10-15fe-443c-9404-e3afc57c7667",
          "citation": "CYCLOPENTANONE [HSDB]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "fdff1094-992e-59c1-7004-cd71de9aaf95",
          "citation": "WIKI",
          "url": "https://en.wikipedia.org/wiki/Cyclopentanone",
          "doc_type": "WIKI",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "6616f169-0119-5ab9-d44f-5b0a8d454cc5",
          "citation": "WEBSITE",
          "url": "https://toxnet.nlm.nih.gov/cgi-bin/sis/search2/r?dbs+hsdb:@term+@rn+@rel+120-92-3",
          "doc_type": "WEBSITE",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "cf2eadda-029c-9d15-844b-e267d4777c1b",
          "citation": "WEBSITE",
          "url": "https://comptox.epa.gov/dashboard/dsstoxdb/results?utf8=%E2%9C%93&search=120-92-3",
          "doc_type": "WEBSITE",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "7d9fd72c-97f7-4e1a-9e64-dc5d89f83e4e",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        },
        {
          "uuid": "2f261cc2-1347-3bd4-c10c-2465cae19a9f",
          "citation": "RXNORM",
          "doc_type": "NLM",
          "public_domain": true
        },
        {
          "uuid": "41c571ff-2dbe-0351-7d33-1deceaee8ef2",
          "doc_type": "SYSTEM",
          "public_domain": true
        },
        {
          "uuid": "752cfb07-bb7a-4e48-fdb2-d7f6a2af85c6",
          "citation": "DailyMed",
          "doc_type": "DAILYMED",
          "public_domain": true
        },
        {
          "uuid": "611be671-c62d-17c2-f094-42fa7af93687",
          "citation": "NCI",
          "doc_type": "NCI DRUG DICTIONARY",
          "public_domain": true
        },
        {
          "uuid": "eece6080-3152-53ee-067d-b7f7f5f55999",
          "citation": "JECFA",
          "doc_type": "JECFA",
          "public_domain": true
        }
      ],
      "definition_type": "PRIMARY",
      "moieties": [
        {
          "uuid": "1fa220da-d6b7-43bb-b2e2-5366d83761a1",
          "id": "1fa220da-d6b7-43bb-b2e2-5366d83761a1",
          "molfile": "\n  CDK     01032518142D\n\n  6  6  0  0  0  0  0  0  0  0999 V2000\n   25.8391   -7.6486    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   25.0590   -8.9996    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   23.5485   -8.7039    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   23.3618   -7.1551    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   22.0009   -6.3924    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n   24.7656   -6.5125    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n  1  2  1  0  0  0  0\n  2  3  1  0  0  0  0\n  3  4  1  0  0  0  0\n  4  5  2  0  0  0  0\n  4  6  1  0  0  0  0\n  1  6  1  0  0  0  0\nM  END",
          "smiles": "C1CCC(=O)C1",
          "formula": "C5H8O",
          "atropisomerism": "No",
          "charge": 0,
          "count": 1,
          "stereochemistry": "ACHIRAL",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "314257f7-e037-4c90-9ac5-2a88a9285b02"
          },
          "defined_stereo": 0,
          "ez_centers": 0,
          "molecular_weight": "84.1166",
          "optical_activity": "NONE",
          "stereo_centers": 0
        }
      ],
      "definition_level": "COMPLETE",
      "uuid": "bb664798-1495-45bc-9264-2814f2275d4f",
      "version": "16",
      "structure": {
        "id": "ffc6b776-2616-42f6-bd39-5c5e13e458e5",
        "molfile": "\n   JSDraw201032518142D\n\n  6  6  0  0  0  0              0 V2000\n   24.7003   -9.6740    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   25.1670   -8.1749    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   23.8968   -7.2823    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   22.6730   -8.1886    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   23.1496   -9.6740    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   23.8968   -5.7180    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n  1  2  1  0  0  0  0\n  3  2  1  0  0  0  0\n  4  3  1  0  0  0  0\n  4  5  1  0  0  0  0\n  5  1  1  0  0  0  0\n  6  3  2  0  0  0  0\nM  END",
        "smiles": "C1CCC(=O)C1",
        "formula": "C5H8O",
        "atropisomerism": "No",
        "charge": 0,
        "count": 1,
        "stereochemistry": "ACHIRAL",
        "defined_stereo": 0,
        "ez_centers": 0,
        "molecular_weight": "84.1166",
        "optical_activity": "NONE",
        "references": [
          "93fb7777-c905-45df-8e19-b47c525aba34",
          "2f9422e6-185c-4c7f-b8a3-783ae9eff0b8"
        ],
        "stereo_centers": 0
      },
      "unii": "220W81TN3S"
    }
  ]
}