{
  "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": "b766f2dd-cf94-4dc9-9f3c-1bbe33834f6e",
          "code": "2-METHYL-2-PENTENOIC ACID",
          "comments": "JECFA|FUNCTIONAL CLASSIFICATION|Flavouring Agent",
          "type": "PRIMARY",
          "url": "http://apps.who.int/food-additives-contaminants-jecfa-database/chemical.aspx?chemID=4846",
          "code_system": "JECFA EVALUATION",
          "references": [
            "20d3b1a4-4792-4e1a-8927-170f0f75c5ab"
          ]
        },
        {
          "uuid": "6e28630a-5f3d-4de0-bee0-d7ad4da9ae1b",
          "code": "16957-70-3",
          "type": "PRIMARY",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=16957-70-3",
          "code_system": "CAS",
          "references": [
            "20d3b1a4-4792-4e1a-8927-170f0f75c5ab",
            "1e632f89-6682-436e-bbfe-660eb11b9dc2"
          ]
        },
        {
          "uuid": "62807f15-b837-4c08-b412-12a4627d3843",
          "code": "241-026-4",
          "type": "PRIMARY",
          "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.037.282",
          "code_system": "ECHA (EC/EINECS)",
          "references": [
            "20d3b1a4-4792-4e1a-8927-170f0f75c5ab"
          ]
        },
        {
          "uuid": "023a73ea-677f-43c1-b9c2-b00c8942a15f",
          "code": "5365909",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/compound/5365909",
          "code_system": "PUBCHEM",
          "references": [
            "20d3b1a4-4792-4e1a-8927-170f0f75c5ab"
          ]
        },
        {
          "uuid": "1fc5e35d-8b9d-4652-b604-4050287d99bc",
          "code": "44I99E898B",
          "type": "PRIMARY",
          "code_system": "FDA UNII"
        },
        {
          "uuid": "2b3bdb1a-090f-6f5a-3dc3-29e4964a7b37",
          "code": "DTXSID30884951",
          "type": "PRIMARY",
          "url": "https://comptox.epa.gov/dashboard/chemical/details/DTXSID30884951",
          "code_system": "EPA CompTox"
        },
        {
          "uuid": "b7bc3ee7-03b9-2cd5-43b8-c44bafca5bd7",
          "code": "1219",
          "type": "PRIMARY",
          "url": "https://www.fao.org/food/food-safety-quality/scientific-advice/jecfa/jecfa-flav/details/en/c/1219/",
          "code_system": "JECFA MONOGRAPH",
          "references": [
            "45a1fa02-6acf-7eeb-5e93-6d5478bcb2c9"
          ]
        }
      ],
      "substance_class": "chemical",
      "names": [
        {
          "uuid": "309603ee-4f15-4606-9b27-28b4c7d09338",
          "name": "(E)-2-METHYL-2-PENTENOIC ACID",
          "stdName": "(E)-2-METHYL-2-PENTENOIC ACID",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "377b8aca-b9e2-4724-96a9-1f9881913c64"
          ],
          "display_name": false
        },
        {
          "uuid": "5e0d4da1-8e1c-4492-af9e-5010b4de0718",
          "name": "2-METHYL-2-PENTENOIC ACID",
          "stdName": "2-METHYL-2-PENTENOIC ACID",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "206874de-c9f1-4d4e-8f1a-852b8452ff93",
            "868f4d86-2a20-4c10-87dc-cde0555ef4e2",
            "d140441d-115f-472a-9832-ccfd84e93c8d",
            "78d3ef01-9998-41fe-9415-8729d84c0b53"
          ],
          "display_name": true
        },
        {
          "uuid": "090010de-000b-4efa-afdc-06dcf1202887",
          "name": "2-METHYL-2-PENTENOIC ACID [FCC]",
          "stdName": "2-METHYL-2-PENTENOIC ACID [FCC]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "206874de-c9f1-4d4e-8f1a-852b8452ff93"
          ],
          "display_name": false
        },
        {
          "uuid": "10b74ab4-33a4-479e-b286-65b39c815c2b",
          "name": "2-METHYL-2-PENTENOIC ACID [FHFI]",
          "stdName": "2-METHYL-2-PENTENOIC ACID [FHFI]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "d140441d-115f-472a-9832-ccfd84e93c8d"
          ],
          "display_name": false
        },
        {
          "uuid": "e5ad6e81-1cda-4d7b-b579-1abe71deb7bd",
          "name": "2-METHYL-2-PENTENOIC ACID, (2E)-",
          "stdName": "2-METHYL-2-PENTENOIC ACID, (2E)-",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "cac94d36-cf79-4ff0-b4f3-4635ffab8f37"
          ],
          "display_name": false
        },
        {
          "uuid": "960c45bf-89dd-4cb5-a304-6aa63a33fd93",
          "name": "2-METHYL-2-PENTENOIC ACID, TRANS-",
          "stdName": "2-METHYL-2-PENTENOIC ACID, TRANS-",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "45b94f9d-dbda-4e14-9cee-64fe0c313683"
          ],
          "display_name": false
        },
        {
          "uuid": "639ae7b1-3b8d-4b39-92b1-22c64a1f620d",
          "name": "2-PENTENOIC ACID, 2-METHYL-, (2E)-",
          "stdName": "2-PENTENOIC ACID, 2-METHYL-, (2E)-",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "377b8aca-b9e2-4724-96a9-1f9881913c64"
          ],
          "display_name": false
        },
        {
          "uuid": "573d873e-c2fd-4619-a67a-034cb55f80c8",
          "name": "2-PENTENOIC ACID, 2-METHYL-, (E)-",
          "stdName": "2-PENTENOIC ACID, 2-METHYL-, (E)-",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "377b8aca-b9e2-4724-96a9-1f9881913c64"
          ],
          "display_name": false
        },
        {
          "uuid": "cf0e51cc-da2a-4ebc-8532-c80246469e1a",
          "name": "FEMA NO. 3195",
          "stdName": "FEMA NO. 3195",
          "type": "cd",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "0d43e54d-ee98-4f2d-9381-63008df98041"
          ],
          "display_name": false
        },
        {
          "uuid": "b91bd0a0-915c-4fa1-ace5-c8530932bccb",
          "name": "TRANS-2-METHYL-2-PENTENOIC ACID",
          "stdName": "TRANS-2-METHYL-2-PENTENOIC ACID",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "377b8aca-b9e2-4724-96a9-1f9881913c64"
          ],
          "display_name": false
        }
      ],
      "references": [
        {
          "uuid": "206874de-c9f1-4d4e-8f1a-852b8452ff93",
          "citation": "FCC",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE",
            "AUTO_SELECTED"
          ]
        },
        {
          "uuid": "0d43e54d-ee98-4f2d-9381-63008df98041",
          "citation": "GRAS",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "377b8aca-b9e2-4724-96a9-1f9881913c64",
          "citation": "STN",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "cac94d36-cf79-4ff0-b4f3-4635ffab8f37",
          "citation": "FDA_SRS",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "d140441d-115f-472a-9832-ccfd84e93c8d",
          "citation": "FHFI",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "45b94f9d-dbda-4e14-9cee-64fe0c313683",
          "citation": "CFSAN",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "20d3b1a4-4792-4e1a-8927-170f0f75c5ab",
          "citation": "SRS CODE IMPORT",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493391021000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "8ec5c706-a627-4945-9934-3fccba796d60",
          "citation": "SRS import [44I99E898B]",
          "url": "http://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=44I99E898B",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493391021000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "136a327a-820b-430f-be61-3ed793595f21",
          "citation": "CHEMID  2011",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "868f4d86-2a20-4c10-87dc-cde0555ef4e2",
          "citation": "2-METHYL-2-PENTENOIC ACID [FHFI]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "78d3ef01-9998-41fe-9415-8729d84c0b53",
          "citation": "2-METHYL-2-PENTENOIC ACID [FCC]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "1e632f89-6682-436e-bbfe-660eb11b9dc2",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        },
        {
          "uuid": "45a1fa02-6acf-7eeb-5e93-6d5478bcb2c9",
          "citation": "JECFA",
          "doc_type": "JECFA",
          "public_domain": true
        }
      ],
      "definition_type": "PRIMARY",
      "moieties": [
        {
          "uuid": "69e4ccc5-be72-453d-854e-be14f1e6cde8",
          "id": "69e4ccc5-be72-453d-854e-be14f1e6cde8",
          "molfile": "\n  Marvin  01132105302D          \n\n  8  7  0  0  0  0            999 V2000\n    5.2045   -4.7502    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.9282   -5.1555    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.6407   -4.7502    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.3612   -5.1748    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.3612   -5.9960    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    8.0752   -4.7615    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    8.7878   -5.1748    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    8.0752   -3.9385    0.0000 O   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  2  0  0  0  0\n  4  5  1  0  0  0  0\n  4  6  1  0  0  0  0\n  6  7  1  0  0  0  0\n  6  8  2  0  0  0  0\nM  END",
          "smiles": "CC/C=C(\\C)/C(=O)O",
          "formula": "C6H10O2",
          "atropisomerism": "No",
          "charge": 0,
          "count": 1,
          "stereochemistry": "ACHIRAL",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "b98dabcf-bd03-454c-9604-241842460aea"
          },
          "defined_stereo": 0,
          "ez_centers": 1,
          "molecular_weight": "114.1426",
          "optical_activity": "NONE",
          "stereo_centers": 0
        }
      ],
      "definition_level": "COMPLETE",
      "uuid": "adb48743-c2d2-4c36-8c16-1dcd508e9980",
      "version": "4",
      "structure": {
        "id": "207787a1-e15b-45da-95a9-c3fef58c8775",
        "molfile": "\n  Marvin  01132101502D          \n\n  8  7  0  0  0  0            999 V2000\n    7.3612   -5.1748    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.6407   -4.7502    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.9282   -5.1555    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.2045   -4.7502    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    8.0752   -4.7615    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    8.7878   -5.1748    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    8.0752   -3.9385    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    7.3612   -5.9960    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n  1  2  2  0  0  0  0\n  2  3  1  0  0  0  0\n  3  4  1  0  0  0  0\n  1  5  1  0  0  0  0\n  5  6  1  0  0  0  0\n  5  7  2  0  0  0  0\n  1  8  1  0  0  0  0\nM  END",
        "smiles": "CC/C=C(\\C)/C(=O)O",
        "formula": "C6H10O2",
        "atropisomerism": "No",
        "charge": 0,
        "count": 1,
        "stereochemistry": "ACHIRAL",
        "defined_stereo": 0,
        "ez_centers": 1,
        "molecular_weight": "114.1426",
        "optical_activity": "NONE",
        "references": [
          "136a327a-820b-430f-be61-3ed793595f21",
          "8ec5c706-a627-4945-9934-3fccba796d60"
        ],
        "stereo_centers": 0
      },
      "unii": "44I99E898B"
    }
  ]
}