{
  "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": "cac72d2e-b38f-465e-8205-ca328756eb5a",
          "code": "57681-53-5",
          "type": "PRIMARY",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=57681-53-5",
          "code_system": "CAS",
          "references": [
            "00606645-49ca-497a-82e3-c9028ad2ea32",
            "29618ba3-5ccc-484d-a30f-3f049799f1d7"
          ]
        },
        {
          "uuid": "a568c220-6526-4d15-8b75-5d8795ac6ef9",
          "code": "159440-29-6",
          "type": "SUPERSEDED",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=159440-29-6",
          "code_system": "CAS",
          "references": [
            "00606645-49ca-497a-82e3-c9028ad2ea32",
            "4f28d709-c108-4750-afb2-81d9f79f74ef"
          ]
        },
        {
          "uuid": "1877166f-ceea-446f-b504-8ae0ed56a3c6",
          "code": "102104-17-6",
          "type": "SUPERSEDED",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=102104-17-6",
          "code_system": "CAS",
          "references": [
            "00606645-49ca-497a-82e3-c9028ad2ea32",
            "934a4847-fb59-488f-baef-fe1f541e1520"
          ]
        },
        {
          "uuid": "b265f327-3128-4965-9ad1-da25c5d1cf90",
          "code": "260-902-7",
          "type": "PRIMARY",
          "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.055.348",
          "code_system": "ECHA (EC/EINECS)",
          "references": [
            "00606645-49ca-497a-82e3-c9028ad2ea32"
          ]
        },
        {
          "uuid": "d0576b29-ec1a-4215-a105-e4c987d892b2",
          "code": "93769",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/compound/93769",
          "code_system": "PUBCHEM",
          "references": [
            "00606645-49ca-497a-82e3-c9028ad2ea32"
          ]
        },
        {
          "uuid": "5a8c62b6-cb11-4539-94d4-1d2aec7a0cab",
          "code": "XXV2BP7ELX",
          "type": "PRIMARY",
          "code_system": "FDA UNII"
        },
        {
          "uuid": "883d4c5a-4008-9487-181b-1b030220b137",
          "code": "DTXSID60866644",
          "type": "PRIMARY",
          "url": "https://comptox.epa.gov/dashboard/chemical/details/DTXSID60866644",
          "code_system": "EPA CompTox"
        }
      ],
      "substance_class": "chemical",
      "names": [
        {
          "uuid": "51502592-25e8-4ae2-96e9-e900b1f2ab40",
          "name": "2(5H)-Furanone, 5-propyl-",
          "stdName": "2(5H)-FURANONE, 5-PROPYL-",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "48f9058a-9d73-4436-9871-08756dfa915d",
            "bf620bd0-349b-404d-8cc5-f412a2339211"
          ],
          "display_name": false
        },
        {
          "uuid": "8983384f-8eeb-465e-ae72-606b252ed893",
          "name": "2-Heptenoic acid, 4-hydroxy-, γ-lactone",
          "stdName": "2-HEPTENOIC ACID, 4-HYDROXY-, .GAMMA.-LACTONE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "48f9058a-9d73-4436-9871-08756dfa915d",
            "bf620bd0-349b-404d-8cc5-f412a2339211"
          ],
          "display_name": false
        },
        {
          "uuid": "99216e5d-196e-4b97-8b0d-1e8f328a3934",
          "name": "4-Hydroxy-2-heptenoic acid lactone",
          "stdName": "4-HYDROXY-2-HEPTENOIC ACID LACTONE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "48f9058a-9d73-4436-9871-08756dfa915d",
            "bf620bd0-349b-404d-8cc5-f412a2339211"
          ],
          "display_name": false
        },
        {
          "uuid": "28da5b1e-536d-4abe-b293-2db2e7722641",
          "name": "5-Propyl-2(5H)-furanone",
          "stdName": "5-PROPYL-2(5H)-FURANONE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "48f9058a-9d73-4436-9871-08756dfa915d",
            "bf620bd0-349b-404d-8cc5-f412a2339211"
          ],
          "display_name": true
        },
        {
          "uuid": "156e8225-839b-46db-a51b-d02cf934cac2",
          "name": "5-Propyl-2,5-dihydrofuran-2-one",
          "stdName": "5-PROPYL-2,5-DIHYDROFURAN-2-ONE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "48f9058a-9d73-4436-9871-08756dfa915d",
            "bf620bd0-349b-404d-8cc5-f412a2339211"
          ],
          "display_name": false
        }
      ],
      "references": [
        {
          "uuid": "48f9058a-9d73-4436-9871-08756dfa915d",
          "citation": "STN",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "bf620bd0-349b-404d-8cc5-f412a2339211",
          "citation": "STN (SCIFINDER)",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "00606645-49ca-497a-82e3-c9028ad2ea32",
          "citation": "SRS CODE IMPORT",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493392604000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "29618ba3-5ccc-484d-a30f-3f049799f1d7",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        },
        {
          "uuid": "4f28d709-c108-4750-afb2-81d9f79f74ef",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        },
        {
          "uuid": "934a4847-fb59-488f-baef-fe1f541e1520",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        }
      ],
      "definition_type": "PRIMARY",
      "moieties": [
        {
          "uuid": "0e7370e4-b8e6-451c-95aa-c282dfa3d791",
          "id": "0e7370e4-b8e6-451c-95aa-c282dfa3d791",
          "molfile": "\n  Marvin  01132100592D          \n\n  9  9  0  0  0  0            999 V2000\n   10.8895   -6.0035    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   10.1049   -6.2584    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    9.4917   -5.7063    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    8.7071   -5.9613    0.0000 C   0  0  0  0  0  0  0  0  0  3  0  0\n    8.0397   -5.4764    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    7.3723   -5.9613    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.5876   -5.7063    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    7.6272   -6.7459    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    8.4522   -6.7459    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  3  4  1  0  0  0  0\n  4  5  1  0  0  0  0\n  4  9  1  0  0  0  0\n  5  6  1  0  0  0  0\n  6  7  2  0  0  0  0\n  6  8  1  0  0  0  0\n  9  8  2  0  0  0  0\nM  END",
          "smiles": "CCCC1C=CC(=O)O1",
          "formula": "C7H10O2",
          "atropisomerism": "No",
          "charge": 0,
          "count": 1,
          "stereochemistry": "RACEMIC",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "ff863ffb-74b3-4453-8a24-6e4cf813b2ca"
          },
          "defined_stereo": 0,
          "ez_centers": 0,
          "molecular_weight": "126.1534",
          "optical_activity": "( + / - )",
          "stereo_centers": 1
        }
      ],
      "definition_level": "COMPLETE",
      "uuid": "71f07455-6a5e-44a1-a479-d30b01188cd1",
      "version": "7",
      "structure": {
        "id": "1b0284db-0700-4d21-a077-ff696a6b32c4",
        "molfile": "\n  Marvin  01132101352D          \n\n  9  9  0  0  0  0            999 V2000\n    9.4917   -5.7063    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   10.1049   -6.2584    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   10.8895   -6.0035    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    8.7071   -5.9613    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    8.0397   -5.4764    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    7.3723   -5.9613    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.6272   -6.7459    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    8.4522   -6.7459    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.5876   -5.7063    0.0000 O   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  1  4  1  0  0  0  0\n  4  5  1  0  0  0  0\n  5  6  1  0  0  0  0\n  6  7  1  0  0  0  0\n  8  7  2  0  0  0  0\n  4  8  1  0  0  0  0\n  6  9  2  0  0  0  0\nM  END",
        "smiles": "CCCC1C=CC(=O)O1",
        "formula": "C7H10O2",
        "atropisomerism": "No",
        "charge": 0,
        "count": 1,
        "stereochemistry": "RACEMIC",
        "defined_stereo": 0,
        "ez_centers": 0,
        "molecular_weight": "126.1534",
        "optical_activity": "( + / - )",
        "references": [
          "48f9058a-9d73-4436-9871-08756dfa915d"
        ],
        "stereo_centers": 1
      },
      "unii": "XXV2BP7ELX"
    }
  ]
}