{
  "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": "55a3a9bb-0df5-4980-8e59-e08797b9740a",
          "code": "20474-93-5",
          "type": "PRIMARY",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=20474-93-5",
          "code_system": "CAS",
          "references": [
            "667d1274-b9ef-4400-83a5-fc4e2048005b",
            "aeca1787-0cdc-47ea-8894-9cbffd676e8d"
          ]
        },
        {
          "uuid": "ac0ef950-9a76-4e40-99f0-12d832777e95",
          "code": "243-845-2",
          "type": "PRIMARY",
          "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.039.844",
          "code_system": "ECHA (EC/EINECS)",
          "references": [
            "667d1274-b9ef-4400-83a5-fc4e2048005b"
          ]
        },
        {
          "uuid": "e9c0a8ed-77a5-4418-998c-c4ad0646b3ed",
          "code": "5354763",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/compound/5354763",
          "code_system": "PUBCHEM",
          "references": [
            "667d1274-b9ef-4400-83a5-fc4e2048005b"
          ]
        },
        {
          "uuid": "3bccf980-4a12-4fa1-ad93-875570a156c4",
          "code": "QK441L7HUM",
          "type": "PRIMARY",
          "code_system": "FDA UNII"
        },
        {
          "uuid": "f042cc34-8c65-653f-d19d-2a8abfbf5dbe",
          "code": "DTXSID80864945",
          "type": "PRIMARY",
          "url": "https://comptox.epa.gov/dashboard/chemical/details/DTXSID80864945",
          "code_system": "EPA CompTox"
        },
        {
          "uuid": "0f8a8ebb-4b59-3c4c-eb70-5dc9d3a0bd41",
          "code": "18598",
          "type": "PRIMARY",
          "url": "https://dtp.cancer.gov/dtpstandard/servlet/dwindex?searchtype=NSC&outputformat=html&searchlist=18598",
          "code_system": "NSC",
          "references": [
            "741604e2-9870-6015-a170-09ca6b0dc833"
          ]
        }
      ],
      "substance_class": "chemical",
      "names": [
        {
          "uuid": "48fc1cce-e945-41e3-b02c-f3247101ee3a",
          "name": "2-BUTENOIC ACID, 2-PROPENYL ESTER",
          "stdName": "2-BUTENOIC ACID, 2-PROPENYL ESTER",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "81fec061-3466-4079-95e4-bd5054c7a323",
            "47db2d4c-cc9c-4a83-856b-089f09f301d0"
          ],
          "display_name": false
        },
        {
          "uuid": "d8761bbc-64c3-4ea4-b6fe-bfd5dbe682eb",
          "name": "2-PROPENYL 2-BUTENOATE",
          "stdName": "2-PROPENYL 2-BUTENOATE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "81fec061-3466-4079-95e4-bd5054c7a323",
            "47db2d4c-cc9c-4a83-856b-089f09f301d0"
          ],
          "display_name": false
        },
        {
          "uuid": "08e90661-0cbe-478b-96a6-fbac56f5be82",
          "name": "ALLYL 2-BUTENOATE",
          "stdName": "ALLYL 2-BUTENOATE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "81fec061-3466-4079-95e4-bd5054c7a323",
            "47db2d4c-cc9c-4a83-856b-089f09f301d0"
          ],
          "display_name": false
        },
        {
          "uuid": "f13ecba5-70a0-481d-824a-01f451ff5e0b",
          "name": "ALLYL BETA-METHYLACRYLATE",
          "stdName": "ALLYL BETA-METHYLACRYLATE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "81fec061-3466-4079-95e4-bd5054c7a323",
            "47db2d4c-cc9c-4a83-856b-089f09f301d0"
          ],
          "display_name": false
        },
        {
          "uuid": "a59f2484-487b-439d-bb81-be51ed2b2473",
          "name": "ALLYL CROTONATE",
          "stdName": "ALLYL CROTONATE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "81fec061-3466-4079-95e4-bd5054c7a323",
            "c139b63e-a323-429f-ba12-9697ab56e2f6",
            "47db2d4c-cc9c-4a83-856b-089f09f301d0",
            "99de86a6-9a8d-49a7-ac34-933cecc0fcd1"
          ],
          "display_name": true
        },
        {
          "uuid": "7a0a343e-f5be-47b5-a2a5-e977b869c519",
          "name": "ALLYL CROTONATE [FHFI]",
          "stdName": "ALLYL CROTONATE [FHFI]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "81fec061-3466-4079-95e4-bd5054c7a323",
            "c139b63e-a323-429f-ba12-9697ab56e2f6"
          ],
          "display_name": false
        },
        {
          "uuid": "43813417-756c-48bf-8163-b352feadf146",
          "name": "ALLYL TRANS-2-BUTENOATE",
          "stdName": "ALLYL TRANS-2-BUTENOATE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "81fec061-3466-4079-95e4-bd5054c7a323",
            "47db2d4c-cc9c-4a83-856b-089f09f301d0"
          ],
          "display_name": false
        },
        {
          "uuid": "f02f2271-1128-4907-b086-68fe58c89628",
          "name": "CROTONIC ACID, ALLYL ESTER",
          "stdName": "CROTONIC ACID, ALLYL ESTER",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "81fec061-3466-4079-95e4-bd5054c7a323",
            "47db2d4c-cc9c-4a83-856b-089f09f301d0"
          ],
          "display_name": false
        },
        {
          "uuid": "7204037d-a437-45c3-9122-eaa286f5dfd8",
          "name": "FEMA NO. 4072",
          "stdName": "FEMA NO. 4072",
          "type": "cd",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "81fec061-3466-4079-95e4-bd5054c7a323",
            "c139b63e-a323-429f-ba12-9697ab56e2f6"
          ],
          "display_name": false
        },
        {
          "uuid": "2fa2b316-f043-9e39-89fa-b55cdece8313",
          "name": "NSC-18598",
          "stdName": "NSC-18598",
          "type": "cd",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "741604e2-9870-6015-a170-09ca6b0dc833"
          ],
          "display_name": false
        }
      ],
      "references": [
        {
          "uuid": "47db2d4c-cc9c-4a83-856b-089f09f301d0",
          "citation": "CHEMID",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE",
            "AUTO_SELECTED"
          ]
        },
        {
          "uuid": "81fec061-3466-4079-95e4-bd5054c7a323",
          "citation": "CHEMID",
          "doc_type": "CHEMID",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "c139b63e-a323-429f-ba12-9697ab56e2f6",
          "citation": "FHFI",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "667d1274-b9ef-4400-83a5-fc4e2048005b",
          "citation": "SRS CODE IMPORT",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493391126000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "519a9c4c-5914-41af-9a6d-32331e4d4b79",
          "citation": "SRS import [QK441L7HUM]",
          "url": "http://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=QK441L7HUM",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493391126000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "99de86a6-9a8d-49a7-ac34-933cecc0fcd1",
          "citation": "ALLYL CROTONATE [FHFI]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "741604e2-9870-6015-a170-09ca6b0dc833",
          "citation": "NCI",
          "doc_type": "NCI DRUG DICTIONARY",
          "public_domain": true
        },
        {
          "uuid": "aeca1787-0cdc-47ea-8894-9cbffd676e8d",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        }
      ],
      "definition_type": "PRIMARY",
      "moieties": [
        {
          "uuid": "cfde09a3-79a7-42ed-a1ba-d7bff46ba88f",
          "id": "cfde09a3-79a7-42ed-a1ba-d7bff46ba88f",
          "molfile": "\n  Marvin  01132110452D          \n\n  9  8  0  0  0  0            999 V2000\n    7.5580   -2.3057    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.8401   -2.7084    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.1260   -2.2839    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.4059   -2.6865    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.4059   -3.4998    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    4.7117   -2.2681    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    3.9917   -2.6707    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    3.2776   -2.2522    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    2.5596   -2.6549    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  2  0  0  0  0\n  4  3  1  0  0  0  0\n  4  5  2  0  0  0  0\n  4  6  1  0  0  0  0\n  6  7  1  0  0  0  0\n  7  8  1  0  0  0  0\n  8  9  2  0  0  0  0\nM  END",
          "smiles": "C/C=C/C(=O)OCC=C",
          "formula": "C7H10O2",
          "atropisomerism": "No",
          "charge": 0,
          "count": 1,
          "stereochemistry": "ACHIRAL",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "3bb2552c-c670-4eed-8eb2-117f3dcf6248"
          },
          "defined_stereo": 0,
          "ez_centers": 1,
          "molecular_weight": "126.1534",
          "optical_activity": "NONE",
          "stereo_centers": 0
        }
      ],
      "definition_level": "COMPLETE",
      "uuid": "4876556a-0475-431d-af52-a5d251dc129d",
      "version": "5",
      "structure": {
        "id": "0fcce300-7c1a-4e39-94d6-f6a05325a151",
        "molfile": "\n  Marvin  01132101032D          \n\n  9  8  0  0  0  0            999 V2000\n    2.5596   -2.6549    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.5580   -2.3057    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    3.2776   -2.2522    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.8401   -2.7084    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    3.9917   -2.6707    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.4059   -3.4998    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    6.1260   -2.2839    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    4.7117   -2.2681    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    5.4059   -2.6865    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n  3  1  2  0  0  0  0\n  4  2  1  0  0  0  0\n  5  3  1  0  0  0  0\n  7  4  2  0  0  0  0\n  8  5  1  0  0  0  0\n  9  6  2  0  0  0  0\n  9  7  1  0  0  0  0\n  9  8  1  0  0  0  0\nM  END",
        "smiles": "C/C=C/C(=O)OCC=C",
        "formula": "C7H10O2",
        "atropisomerism": "No",
        "charge": 0,
        "count": 1,
        "stereochemistry": "ACHIRAL",
        "defined_stereo": 0,
        "ez_centers": 1,
        "molecular_weight": "126.1534",
        "optical_activity": "NONE",
        "references": [
          "519a9c4c-5914-41af-9a6d-32331e4d4b79",
          "47db2d4c-cc9c-4a83-856b-089f09f301d0"
        ],
        "stereo_centers": 0
      },
      "unii": "QK441L7HUM"
    }
  ]
}