{
  "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": "c4b8f29d-e5a0-45b9-834b-46be865e2e28",
          "code": "287-92-3",
          "type": "PRIMARY",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=287-92-3",
          "code_system": "CAS",
          "references": [
            "40a5f737-1749-410e-b427-f0df5191409a",
            "17230d77-8214-4a25-b9dd-2ec250517a80"
          ]
        },
        {
          "uuid": "cb4e7a5c-a04f-401b-94de-2745ac072cbc",
          "code": "CYCLOPENTANE",
          "type": "PRIMARY",
          "url": "https://en.wikipedia.org/wiki/Cyclopentane",
          "code_system": "WIKIPEDIA",
          "references": [
            "40a5f737-1749-410e-b427-f0df5191409a"
          ]
        },
        {
          "uuid": "b62f2fc3-5d73-407a-abda-64d70f6cc52c",
          "code": "206-016-6",
          "type": "PRIMARY",
          "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.005.470",
          "code_system": "ECHA (EC/EINECS)",
          "references": [
            "40a5f737-1749-410e-b427-f0df5191409a"
          ]
        },
        {
          "uuid": "2fc4b0b8-96e2-4627-a962-e3801079e018",
          "code": "m4006",
          "comments": "Merck Index",
          "type": "PRIMARY",
          "url": "https://merckindex.rsc.org/monographs/m4006?q=authorize",
          "code_system": "MERCK INDEX",
          "references": [
            "40a5f737-1749-410e-b427-f0df5191409a"
          ]
        },
        {
          "uuid": "7635afd4-95a4-4bb2-a86b-96ef6c023c34",
          "code": "SUB181385",
          "type": "PRIMARY",
          "code_system": "EVMPD",
          "references": [
            "40a5f737-1749-410e-b427-f0df5191409a"
          ]
        },
        {
          "uuid": "1e0f208f-cbe3-4825-8c1d-e2e1c92e9215",
          "code": "9253",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/compound/9253",
          "code_system": "PUBCHEM",
          "references": [
            "40a5f737-1749-410e-b427-f0df5191409a"
          ]
        },
        {
          "uuid": "c8678fe7-8d61-3187-b12a-89492a62c272",
          "code": "62",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/source/hsdb/62",
          "code_system": "HSDB",
          "references": [
            "abda129a-bb1c-840f-59df-59d6c82bbc5f"
          ]
        },
        {
          "uuid": "873e9d76-3ab0-94aa-b489-ffd1aa978642",
          "code": "DTXSID6024886",
          "type": "PRIMARY",
          "url": "https://comptox.epa.gov/dashboard/chemical/details/DTXSID6024886",
          "code_system": "EPA CompTox",
          "references": [
            "12aff44a-8cbc-ee29-e13f-46fc93dc2add"
          ]
        },
        {
          "uuid": "809cbf9d-0dc9-46e5-b17a-2822dbc3c273",
          "code": "T86PB90RNU",
          "type": "PRIMARY",
          "code_system": "FDA UNII"
        },
        {
          "uuid": "ca521a51-efa5-2aa6-a819-02f80420a394",
          "code": "23492",
          "type": "PRIMARY",
          "url": "https://www.ebi.ac.uk/chebi/chebiOntology.do?chebiId=CHEBI:23492",
          "code_system": "CHEBI",
          "references": [
            "7a9a6acf-82c9-dbe3-9740-b222d5891f7a"
          ]
        },
        {
          "uuid": "0bbe5e7b-f1b2-99c2-35d4-64b279693d47",
          "code": "60213",
          "type": "PRIMARY",
          "url": "https://dtp.cancer.gov/dtpstandard/servlet/dwindex?searchtype=NSC&outputformat=html&searchlist=60213",
          "code_system": "NSC",
          "references": [
            "73e4faa2-841b-3c53-322c-24d194f479f9"
          ]
        },
        {
          "uuid": "1c28c3ff-c52a-405f-b853-23b536041a3f",
          "code": "100000167052",
          "type": "PRIMARY",
          "code_system": "SMS_ID",
          "references": [
            "3e55b141-5b56-9373-0df4-f1189e8b7026"
          ]
        }
      ],
      "relationships": [
        {
          "uuid": "da0d8a21-b14a-4ff6-bc1c-2c86486df600",
          "amount": {
            "uuid": "805c2db1-0aa5-4c3d-a41c-7db6e495f1f6"
          },
          "type": "PARENT->IMPURITY",
          "related_substance": {
            "uuid": "17a48a51-1ebd-4899-a732-051cce38748f",
            "refuuid": "572a33bb-89c2-48cd-9623-b51cca98ad0b",
            "name": "Esketamine hydrochloride",
            "unii": "L8P1H35P2Z",
            "linking_id": "L8P1H35P2Z",
            "ref_pname": "Esketamine hydrochloride",
            "substance_class": "reference"
          }
        }
      ],
      "substance_class": "chemical",
      "names": [
        {
          "uuid": "15cdb93f-91d3-464b-ab8c-df91ede0f4c6",
          "name": "CYCLOPENTANE",
          "stdName": "CYCLOPENTANE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "0ef22d9c-638a-46ad-9715-b239929c0e91",
            "b5baa6ff-a981-483b-a5e3-17efa73a4621",
            "b8ee965b-802e-456b-a0fe-c53a9cdfe1a7",
            "dbac0f4f-08d2-46eb-b7f7-0509f4e58d4d",
            "613e82f5-f378-43f9-a6d0-f9e3b7a57ce4",
            "5a4e1474-9725-45d2-bd4b-080c89432ccc"
          ],
          "display_name": true
        },
        {
          "uuid": "395d2ec7-f987-4f02-af9c-ace2be41b5e7",
          "name": "CYCLOPENTANE [HSDB]",
          "stdName": "CYCLOPENTANE [HSDB]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "b5baa6ff-a981-483b-a5e3-17efa73a4621",
            "5a4e1474-9725-45d2-bd4b-080c89432ccc"
          ],
          "display_name": false
        },
        {
          "uuid": "d9f6366c-dbab-4064-87d3-44269e2370c1",
          "name": "CYCLOPENTANE [MI]",
          "stdName": "CYCLOPENTANE [MI]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "b5baa6ff-a981-483b-a5e3-17efa73a4621",
            "b8ee965b-802e-456b-a0fe-c53a9cdfe1a7"
          ],
          "display_name": false
        },
        {
          "uuid": "8a10015a-ec89-45ce-855e-da7e9ca2b5d2",
          "name": "NSC-60213",
          "stdName": "NSC-60213",
          "type": "cd",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "b5baa6ff-a981-483b-a5e3-17efa73a4621",
            "37cda9b5-9389-4f92-a7c1-285a8308783f"
          ],
          "display_name": false
        },
        {
          "uuid": "2f19d4f7-7f76-444b-bbe1-41265c9d1c23",
          "name": "PENTAMETHYLENE",
          "stdName": "PENTAMETHYLENE",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "b5baa6ff-a981-483b-a5e3-17efa73a4621",
            "67a73464-66e4-44af-ba7f-6c7157c9e439"
          ],
          "display_name": false
        }
      ],
      "references": [
        {
          "uuid": "613e82f5-f378-43f9-a6d0-f9e3b7a57ce4",
          "citation": "ICSAS BATCH 2010",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE",
            "AUTO_SELECTED"
          ]
        },
        {
          "uuid": "b8ee965b-802e-456b-a0fe-c53a9cdfe1a7",
          "citation": "MERCK INDEX",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "b5baa6ff-a981-483b-a5e3-17efa73a4621",
          "citation": "MERCK INDEX",
          "doc_type": "MERCK INDEX",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "67a73464-66e4-44af-ba7f-6c7157c9e439",
          "citation": "Merck",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "37cda9b5-9389-4f92-a7c1-285a8308783f",
          "citation": "ChemID",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "5a4e1474-9725-45d2-bd4b-080c89432ccc",
          "citation": "HSDB",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "40a5f737-1749-410e-b427-f0df5191409a",
          "citation": "SRS CODE IMPORT",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493390894000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "6b1aa5c5-e71d-4664-85a6-dfa67bfe4497",
          "citation": "SRS import [T86PB90RNU]",
          "url": "http://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=T86PB90RNU",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493390894000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "6927bd46-1d07-48a1-a7af-4b563b245783",
          "citation": "CHEMID 2010",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "dbac0f4f-08d2-46eb-b7f7-0509f4e58d4d",
          "citation": "CYCLOPENTANE [MI]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "0ef22d9c-638a-46ad-9715-b239929c0e91",
          "citation": "CYCLOPENTANE [HSDB]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "abda129a-bb1c-840f-59df-59d6c82bbc5f",
          "citation": "WEBSITE",
          "url": "https://toxnet.nlm.nih.gov/cgi-bin/sis/search2/r?dbs+hsdb:@term+@rn+@rel+287-92-3",
          "doc_type": "WEBSITE",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "12aff44a-8cbc-ee29-e13f-46fc93dc2add",
          "citation": "WEBSITE",
          "url": "https://comptox.epa.gov/dashboard/dsstoxdb/results?utf8=%E2%9C%93&search=287-92-3",
          "doc_type": "WEBSITE",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "7a9a6acf-82c9-dbe3-9740-b222d5891f7a",
          "doc_type": "SYSTEM",
          "public_domain": true
        },
        {
          "uuid": "17230d77-8214-4a25-b9dd-2ec250517a80",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        },
        {
          "uuid": "73e4faa2-841b-3c53-322c-24d194f479f9",
          "citation": "NCI",
          "doc_type": "NCI DRUG DICTIONARY",
          "public_domain": true
        },
        {
          "uuid": "3e55b141-5b56-9373-0df4-f1189e8b7026",
          "citation": "EU-SRS",
          "doc_type": "EMA LIST",
          "public_domain": true
        }
      ],
      "definition_type": "PRIMARY",
      "moieties": [
        {
          "uuid": "64cf1376-d7e4-4fcc-9c8c-f5f7402d166d",
          "id": "64cf1376-d7e4-4fcc-9c8c-f5f7402d166d",
          "molfile": "\n  Marvin  01132105152D          \n\n  5  5  0  0  0  0            999 V2000\n    6.1891   -4.6973    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.1424   -5.5143    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.9041   -5.8229    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.4377   -5.1813    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.9857   -4.4827    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n  1  2  1  0  0  0  0\n  1  5  1  0  0  0  0\n  2  3  1  0  0  0  0\n  3  4  1  0  0  0  0\n  5  4  1  0  0  0  0\nM  END",
          "smiles": "C1CCCC1",
          "formula": "C5H10",
          "atropisomerism": "No",
          "charge": 0,
          "count": 1,
          "stereochemistry": "ACHIRAL",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "f25c4924-1c01-4e47-85bc-63a037e14cb9"
          },
          "defined_stereo": 0,
          "ez_centers": 0,
          "molecular_weight": "70.1331",
          "optical_activity": "NONE",
          "stereo_centers": 0
        }
      ],
      "definition_level": "COMPLETE",
      "uuid": "e9e6d575-240e-4d36-a1ff-df57420e964e",
      "version": "8",
      "structure": {
        "id": "1b70b5d9-5455-4b93-bc69-0dcf17c7ce21",
        "molfile": "\n  Marvin  01132101362D          \n\n  5  5  0  0  0  0            999 V2000\n    6.1891   -4.6973    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.1424   -5.5143    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.9041   -5.8229    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.4377   -5.1813    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.9857   -4.4827    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  5  4  1  0  0  0  0\n  1  5  1  0  0  0  0\nM  END",
        "smiles": "C1CCCC1",
        "formula": "C5H10",
        "atropisomerism": "No",
        "charge": 0,
        "count": 1,
        "stereochemistry": "ACHIRAL",
        "defined_stereo": 0,
        "ez_centers": 0,
        "molecular_weight": "70.1331",
        "optical_activity": "NONE",
        "references": [
          "6b1aa5c5-e71d-4664-85a6-dfa67bfe4497",
          "6927bd46-1d07-48a1-a7af-4b563b245783"
        ],
        "stereo_centers": 0
      },
      "unii": "T86PB90RNU"
    }
  ]
}