{
  "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": "7da7b955-1549-4973-87f3-7c0f1509060b",
          "code": "2407-43-4",
          "type": "PRIMARY",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=2407-43-4",
          "code_system": "CAS",
          "references": [
            "32283109-a82d-4fe5-8ebf-01f7518211c7",
            "70056fa9-29cb-4a0d-b78b-7bd7726b6baa"
          ]
        },
        {
          "uuid": "b2d9db88-c7a6-4c20-8446-87b13a989e14",
          "code": "219-304-1",
          "type": "PRIMARY",
          "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.017.550",
          "code_system": "ECHA (EC/EINECS)",
          "references": [
            "32283109-a82d-4fe5-8ebf-01f7518211c7"
          ]
        },
        {
          "uuid": "02b22719-b332-47a1-8e52-33045dc37793",
          "code": "16997",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/compound/16997",
          "code_system": "PUBCHEM",
          "references": [
            "32283109-a82d-4fe5-8ebf-01f7518211c7"
          ]
        },
        {
          "uuid": "86f00410-8246-4df8-ba8d-761ae48aa9e9",
          "code": "285X4S123E",
          "type": "PRIMARY",
          "code_system": "FDA UNII"
        },
        {
          "uuid": "1e35e089-7f19-255f-176f-411e724808d5",
          "code": "DTXSID60862924",
          "type": "PRIMARY",
          "url": "https://comptox.epa.gov/dashboard/chemical/details/DTXSID60862924",
          "code_system": "EPA CompTox"
        }
      ],
      "substance_class": "chemical",
      "names": [
        {
          "uuid": "8d999c1f-2565-4ef4-a734-acff576a5900",
          "name": "2(5H)-FURANONE, 5-ETHYL-",
          "stdName": "2(5H)-FURANONE, 5-ETHYL-",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "72029071-1234-41bf-962e-3fb03f41b262"
          ],
          "display_name": false
        },
        {
          "uuid": "f818bd97-caa3-45e9-a576-334a50113d8d",
          "name": "2-HEXEN-4-OLIDE",
          "stdName": "2-HEXEN-4-OLIDE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "72029071-1234-41bf-962e-3fb03f41b262"
          ],
          "display_name": false
        },
        {
          "uuid": "3bfa8d80-8cc9-418e-a871-c56a467787da",
          "name": "2-HEXENOIC ACID, 4-HYDROXY-, .GAMMA.-LACTONE",
          "stdName": "2-HEXENOIC ACID, 4-HYDROXY-, .GAMMA.-LACTONE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "72029071-1234-41bf-962e-3fb03f41b262"
          ],
          "display_name": false
        },
        {
          "uuid": "c5e85f0e-667e-429e-93e6-c25c3ef81ab6",
          "name": "4-HYDROXY-2-HEXENOIC ACID LACTONE",
          "stdName": "4-HYDROXY-2-HEXENOIC ACID LACTONE",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "ee3c1b6a-e5a8-4fa5-a592-c2f2f9d1b911"
          ],
          "display_name": false
        },
        {
          "uuid": "bfaeb1e2-09e0-456c-9ddf-4441d5f6f72d",
          "name": "5-ETHYL-2(5H)-FURANONE",
          "stdName": "5-ETHYL-2(5H)-FURANONE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "72029071-1234-41bf-962e-3fb03f41b262"
          ],
          "display_name": true
        },
        {
          "uuid": "af9dead2-4c0d-4d70-a2d6-6427678df96a",
          "name": "5-ETHYL-2(5H)-FURANONE, (±)-",
          "stdName": "5-ETHYL-2(5H)-FURANONE, (+/-)-",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "72029071-1234-41bf-962e-3fb03f41b262"
          ],
          "display_name": false
        }
      ],
      "references": [
        {
          "uuid": "72029071-1234-41bf-962e-3fb03f41b262",
          "citation": "STN",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "32283109-a82d-4fe5-8ebf-01f7518211c7",
          "citation": "SRS CODE IMPORT",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493393566000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "728cd2b4-3adb-4658-9187-b65952cbc56b",
          "citation": "SRS import [285X4S123E]",
          "url": "http://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=285X4S123E",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493393566000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "ee3c1b6a-e5a8-4fa5-a592-c2f2f9d1b911",
          "citation": "CFSAN",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE",
            "AUTO_SELECTED"
          ]
        },
        {
          "uuid": "70056fa9-29cb-4a0d-b78b-7bd7726b6baa",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        }
      ],
      "definition_type": "PRIMARY",
      "moieties": [
        {
          "uuid": "cbef9b3c-a1a1-463c-a8b9-51499524b015",
          "id": "cbef9b3c-a1a1-463c-a8b9-51499524b015",
          "molfile": "\n  Marvin  01132110322D          \n\n  8  8  0  0  0  0            999 V2000\n    2.9679   -0.7686    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    2.3506   -0.2196    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    1.5670   -0.4778    0.0000 C   0  0  0  0  0  0  0  0  0  3  0  0\n    1.3118   -1.2702    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    0.4867   -1.2702    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.0000   -1.9380    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    0.2285   -0.4778    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.8992    0.0000    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n  2  1  1  0  0  0  0\n  3  2  1  0  0  0  0\n  4  3  1  0  0  0  0\n  3  8  1  0  0  0  0\n  4  5  1  0  0  0  0\n  5  6  2  0  0  0  0\n  7  5  1  0  0  0  0\n  8  7  2  0  0  0  0\nM  END",
          "smiles": "CCC1C=CC(=O)O1",
          "formula": "C6H8O2",
          "atropisomerism": "No",
          "charge": 0,
          "count": 1,
          "stereochemistry": "RACEMIC",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "d8e8127d-5ebe-47d1-b1cc-19ca1dcfbd21"
          },
          "defined_stereo": 0,
          "ez_centers": 0,
          "molecular_weight": "112.1268",
          "optical_activity": "( + / - )",
          "stereo_centers": 1
        }
      ],
      "definition_level": "COMPLETE",
      "uuid": "92f21697-1470-4a86-a093-f97507c03e30",
      "version": "5",
      "structure": {
        "id": "8911d6eb-5b8a-46c6-8fe5-3808836c0b28",
        "molfile": "\n  Marvin  01132107072D          \n\n  8  8  0  0  0  0            999 V2000\n    1.3118   -1.2702    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    1.5670   -0.4778    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.8992    0.0000    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.2285   -0.4778    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.4867   -1.2702    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.0000   -1.9380    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    2.3506   -0.2196    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    2.9679   -0.7686    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  2  7  1  0  0  0  0\n  3  4  2  0  0  0  0\n  4  5  1  0  0  0  0\n  5  6  2  0  0  0  0\n  7  8  1  0  0  0  0\nM  END",
        "smiles": "CCC1C=CC(=O)O1",
        "formula": "C6H8O2",
        "atropisomerism": "No",
        "charge": 0,
        "count": 1,
        "stereochemistry": "RACEMIC",
        "defined_stereo": 0,
        "ez_centers": 0,
        "molecular_weight": "112.1268",
        "optical_activity": "( + / - )",
        "references": [
          "ee3c1b6a-e5a8-4fa5-a592-c2f2f9d1b911",
          "728cd2b4-3adb-4658-9187-b65952cbc56b"
        ],
        "stereo_centers": 1
      },
      "unii": "285X4S123E"
    }
  ]
}