{
  "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": "5488d928-3da9-4319-ab1f-be01205484ba",
          "code": "2051-76-5",
          "type": "PRIMARY",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=2051-76-5",
          "code_system": "CAS",
          "references": [
            "7c8cba51-1002-466e-b9b6-a6fdb27f3adf",
            "a3774b6b-4721-4a26-b62c-39dfa50fba0c"
          ]
        },
        {
          "uuid": "4b567b6a-85ad-4a88-b394-e0af9ea2f255",
          "code": "74919",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/compound/74919",
          "code_system": "PUBCHEM",
          "references": [
            "7c8cba51-1002-466e-b9b6-a6fdb27f3adf"
          ]
        },
        {
          "uuid": "ae5cc385-91c8-4eff-8c93-f1eed1862f7a",
          "code": "218-128-2",
          "type": "PRIMARY",
          "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.016.481",
          "code_system": "ECHA (EC/EINECS)",
          "references": [
            "7c8cba51-1002-466e-b9b6-a6fdb27f3adf"
          ]
        },
        {
          "uuid": "274b4d31-edb9-4930-a580-edeba0ea46f9",
          "code": "M4BYS5VWG3",
          "type": "PRIMARY",
          "code_system": "FDA UNII"
        },
        {
          "uuid": "bd80656b-7b5b-a250-e1c5-d668a08ffcc3",
          "code": "DTXSID70942685",
          "type": "PRIMARY",
          "url": "https://comptox.epa.gov/dashboard/chemical/details/DTXSID70942685",
          "code_system": "EPA CompTox"
        },
        {
          "uuid": "2ac5bf63-a2ec-5271-0ee8-16c3d90d7df8",
          "code": "32616",
          "type": "PRIMARY",
          "url": "https://dtp.cancer.gov/dtpstandard/servlet/dwindex?searchtype=NSC&outputformat=html&searchlist=32616",
          "code_system": "NSC",
          "references": [
            "bf2b3d8d-4102-a8ed-8839-4cac767a9f16"
          ]
        }
      ],
      "substance_class": "chemical",
      "names": [
        {
          "uuid": "1b9db488-3290-4179-8153-7c14849cda65",
          "name": "2-PROPENOIC ACID, 1,1'-ANHYDRIDE",
          "stdName": "2-PROPENOIC ACID, 1,1'-ANHYDRIDE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "3f84fb29-741e-4d08-a500-2535843848c4",
            "ae888529-4fa0-45ce-ae85-9af8dd4a6e5a"
          ],
          "display_name": false
        },
        {
          "uuid": "65140910-73ea-459c-b63d-733aebb2ccdb",
          "name": "2-PROPENOIC ACID, ANHYDRIDE",
          "stdName": "2-PROPENOIC ACID, ANHYDRIDE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "3f84fb29-741e-4d08-a500-2535843848c4",
            "ae888529-4fa0-45ce-ae85-9af8dd4a6e5a"
          ],
          "display_name": false
        },
        {
          "uuid": "ce3dad9e-7795-46af-b0a6-5f087ef91683",
          "name": "ACRYLIC ACID ANHYDRIDE",
          "stdName": "ACRYLIC ACID ANHYDRIDE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "3f84fb29-741e-4d08-a500-2535843848c4",
            "ae888529-4fa0-45ce-ae85-9af8dd4a6e5a"
          ],
          "display_name": false
        },
        {
          "uuid": "84fc92bb-ae7d-41b4-af83-de80b7314f27",
          "name": "ACRYLIC ANHYDRIDE",
          "stdName": "ACRYLIC ANHYDRIDE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "3f84fb29-741e-4d08-a500-2535843848c4"
          ],
          "display_name": true
        },
        {
          "uuid": "50017452-1dd8-4d9a-aa7f-929de4db1ea8",
          "name": "NSC-32616",
          "stdName": "NSC-32616",
          "type": "cd",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "3f84fb29-741e-4d08-a500-2535843848c4",
            "ae888529-4fa0-45ce-ae85-9af8dd4a6e5a"
          ],
          "display_name": false
        }
      ],
      "references": [
        {
          "uuid": "ae888529-4fa0-45ce-ae85-9af8dd4a6e5a",
          "citation": "STN",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "3f84fb29-741e-4d08-a500-2535843848c4",
          "citation": "STN (SCIFINDER)",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "7c8cba51-1002-466e-b9b6-a6fdb27f3adf",
          "citation": "SRS CODE IMPORT",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493391016000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "edcb9be0-d054-44eb-8fa8-9ece58b2d84a",
          "citation": "CHEMID  2011",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "a3774b6b-4721-4a26-b62c-39dfa50fba0c",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true,
          "tags": [
            "PUBLIC_DOMAIN_RELEASE",
            "NOMEN"
          ]
        },
        {
          "uuid": "bf2b3d8d-4102-a8ed-8839-4cac767a9f16",
          "citation": "NCI",
          "doc_type": "NCI DRUG DICTIONARY",
          "public_domain": true
        }
      ],
      "definition_type": "PRIMARY",
      "moieties": [
        {
          "uuid": "39238fd1-275f-42fd-988f-6c7fcf892e96",
          "id": "39238fd1-275f-42fd-988f-6c7fcf892e96",
          "molfile": "\n  Marvin  01132103022D          \n\n  9  8  0  0  0  0            999 V2000\n    8.2986   -6.6576    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.5876   -6.2393    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.5876   -5.4027    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    8.2986   -4.9845    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    6.8765   -4.9845    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    6.8765   -4.1479    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.5876   -3.7295    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    6.1653   -3.7295    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.4543   -4.1479    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  4  3  2  0  0  0  0\n  3  5  1  0  0  0  0\n  5  6  1  0  0  0  0\n  7  6  2  0  0  0  0\n  8  6  1  0  0  0  0\n  9  8  2  0  0  0  0\nM  END",
          "smiles": "C=CC(=O)OC(=O)C=C",
          "formula": "C6H6O3",
          "atropisomerism": "No",
          "charge": 0,
          "count": 1,
          "stereochemistry": "ACHIRAL",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "5d41ae71-d630-4a2c-bf93-75f244650ff0"
          },
          "defined_stereo": 0,
          "ez_centers": 0,
          "molecular_weight": "126.1103",
          "optical_activity": "NONE",
          "stereo_centers": 0
        }
      ],
      "definition_level": "COMPLETE",
      "uuid": "72662d43-49a1-4507-ad64-0d34f4e0d589",
      "version": "9",
      "structure": {
        "id": "0d24a9c2-b129-407a-9e91-fef0ad54dba7",
        "molfile": "\n  Marvin  01132100552D          \n\n  9  8  0  0  0  0            999 V2000\n    6.8765   -4.1479    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.8765   -4.9845    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    7.5876   -5.4027    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.5876   -6.2393    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    8.2986   -6.6576    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    8.2986   -4.9845    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    6.1653   -3.7295    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.4543   -4.1479    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.5876   -3.7295    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  1  0  0  0  0\n  5  4  2  0  0  0  0\n  6  3  2  0  0  0  0\n  7  1  1  0  0  0  0\n  8  7  2  0  0  0  0\n  9  1  2  0  0  0  0\nM  END",
        "smiles": "C=CC(=O)OC(=O)C=C",
        "formula": "C6H6O3",
        "atropisomerism": "No",
        "charge": 0,
        "count": 1,
        "stereochemistry": "ACHIRAL",
        "defined_stereo": 0,
        "ez_centers": 0,
        "molecular_weight": "126.1103",
        "optical_activity": "NONE",
        "references": [
          "edcb9be0-d054-44eb-8fa8-9ece58b2d84a"
        ],
        "stereo_centers": 0
      },
      "unii": "M4BYS5VWG3"
    }
  ]
}