{
  "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": "808498e4-68ca-4011-ade3-669744e4da83",
          "code": "105-45-3",
          "type": "PRIMARY",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=105-45-3",
          "code_system": "CAS",
          "references": [
            "c8a3ab8f-f182-4034-95c0-9f0eb7f7ba42",
            "1474d3f3-87b1-46d0-be40-7dc59a44a32c"
          ]
        },
        {
          "uuid": "192e7f9e-0642-4e8c-a535-3a3b58cc0980",
          "code": "203-299-8",
          "type": "PRIMARY",
          "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.003.000",
          "code_system": "ECHA (EC/EINECS)",
          "references": [
            "c8a3ab8f-f182-4034-95c0-9f0eb7f7ba42"
          ]
        },
        {
          "uuid": "758e0def-edc7-4dc2-9645-055b1c7f927a",
          "code": "m7353",
          "comments": "Merck Index",
          "type": "PRIMARY",
          "url": "https://merckindex.rsc.org/monographs/m7353?q=authorize",
          "code_system": "MERCK INDEX",
          "references": [
            "c8a3ab8f-f182-4034-95c0-9f0eb7f7ba42"
          ]
        },
        {
          "uuid": "f7a03a79-4e15-4699-972e-95c76574c6da",
          "code": "7757",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/compound/7757",
          "code_system": "PUBCHEM",
          "references": [
            "c8a3ab8f-f182-4034-95c0-9f0eb7f7ba42"
          ]
        },
        {
          "uuid": "93f9d999-b106-bffa-7a4a-61a7603c5a0e",
          "code": "1083",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/source/hsdb/1083",
          "code_system": "HSDB",
          "references": [
            "871dbbfb-db44-f46e-d9cc-aab56097ff8d"
          ]
        },
        {
          "uuid": "ec9ddf68-9339-5cd0-f0dd-745c91190900",
          "code": "DTXSID9026716",
          "type": "PRIMARY",
          "url": "https://comptox.epa.gov/dashboard/chemical/details/DTXSID9026716",
          "code_system": "EPA CompTox",
          "references": [
            "add20c95-fd4f-e483-d2d0-2d94ae14da16"
          ]
        },
        {
          "uuid": "9888f15a-c1c9-4a87-902b-62d44f7a16d2",
          "code": "CW4I82QAX1",
          "type": "PRIMARY",
          "code_system": "FDA UNII"
        }
      ],
      "substance_class": "chemical",
      "names": [
        {
          "uuid": "25538253-e916-4d05-8bbf-0cf8ad26e363",
          "name": "Methyl acetoacetate",
          "stdName": "METHYL ACETOACETATE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "87ba78f3-f6c3-4633-8927-71ce60c9e6c1",
            "a5767ada-7026-48ba-a8ab-321f6f75388b",
            "f171fca4-a73d-4fe5-8be7-bfd4343d96b9",
            "6891c4ae-6947-472d-942b-21cce05c8539",
            "995e21da-d994-49ea-b6fb-f0efa4b36f49",
            "91cfeac7-5a15-4cbe-915c-aae454f4e2a0"
          ],
          "display_name": true
        },
        {
          "uuid": "ffabe86b-2ddb-4c34-b9b5-86231dd9c73d",
          "name": "Methyl acetoacetate [HSDB]",
          "stdName": "METHYL ACETOACETATE [HSDB]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "f171fca4-a73d-4fe5-8be7-bfd4343d96b9",
            "91cfeac7-5a15-4cbe-915c-aae454f4e2a0"
          ],
          "display_name": false
        },
        {
          "uuid": "462b2865-8509-4ec8-9a64-54b964d1eacc",
          "name": "Methyl acetoacetate [MI]",
          "stdName": "METHYL ACETOACETATE [MI]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "995e21da-d994-49ea-b6fb-f0efa4b36f49",
            "91cfeac7-5a15-4cbe-915c-aae454f4e2a0"
          ],
          "display_name": false
        }
      ],
      "references": [
        {
          "uuid": "a5767ada-7026-48ba-a8ab-321f6f75388b",
          "citation": "ICSAS BATCH 2010",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE",
            "AUTO_SELECTED"
          ]
        },
        {
          "uuid": "995e21da-d994-49ea-b6fb-f0efa4b36f49",
          "citation": "MERCK INDEX",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "91cfeac7-5a15-4cbe-915c-aae454f4e2a0",
          "citation": "MERCK INDEX",
          "doc_type": "MERCK INDEX",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "f171fca4-a73d-4fe5-8be7-bfd4343d96b9",
          "citation": "HSDB",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "c8a3ab8f-f182-4034-95c0-9f0eb7f7ba42",
          "citation": "SRS CODE IMPORT",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493390959000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "66369ed6-0239-4eef-889c-2b6f4904231b",
          "citation": "SRS import [CW4I82QAX1]",
          "url": "http://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=CW4I82QAX1",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493390959000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "24bce95b-1745-4dab-89b7-35cd654a593f",
          "citation": "CHEMID 2010",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "6891c4ae-6947-472d-942b-21cce05c8539",
          "citation": "METHYL ACETOACETATE [MI]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "87ba78f3-f6c3-4633-8927-71ce60c9e6c1",
          "citation": "METHYL ACETOACETATE [HSDB]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "871dbbfb-db44-f46e-d9cc-aab56097ff8d",
          "citation": "WEBSITE",
          "url": "https://toxnet.nlm.nih.gov/cgi-bin/sis/search2/r?dbs+hsdb:@term+@rn+@rel+105-45-3",
          "doc_type": "WEBSITE",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "add20c95-fd4f-e483-d2d0-2d94ae14da16",
          "citation": "WEBSITE",
          "url": "https://comptox.epa.gov/dashboard/dsstoxdb/results?utf8=%E2%9C%93&search=105-45-3",
          "doc_type": "WEBSITE",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "1474d3f3-87b1-46d0-be40-7dc59a44a32c",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        }
      ],
      "definition_type": "PRIMARY",
      "moieties": [
        {
          "uuid": "56021b37-ecc9-471c-b994-830908c65519",
          "id": "56021b37-ecc9-471c-b994-830908c65519",
          "molfile": "\n  Marvin  01132104282D          \n\n  8  7  0  0  0  0            999 V2000\n    8.6721   -5.2323    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.9588   -5.6466    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    7.2406   -5.2304    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.2406   -4.4513    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    6.5492   -5.6466    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.8292   -5.2323    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.1158   -5.6466    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.8292   -4.4239    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  3  4  2  0  0  0  0\n  3  5  1  0  0  0  0\n  5  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(=O)CC(=O)OC",
          "formula": "C5H8O3",
          "atropisomerism": "No",
          "charge": 0,
          "count": 1,
          "stereochemistry": "ACHIRAL",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "898d66b7-fe94-4e29-a1f1-aadc1615fbe5"
          },
          "defined_stereo": 0,
          "ez_centers": 0,
          "molecular_weight": "116.1154",
          "optical_activity": "NONE",
          "stereo_centers": 0
        }
      ],
      "definition_level": "COMPLETE",
      "uuid": "0609eb9a-2724-45d4-8971-c804d97f56a8",
      "version": "11",
      "structure": {
        "id": "3da7708b-434f-4833-a5fc-799f4111b55e",
        "molfile": "\n  Marvin  01132103162D          \n\n  8  7  0  0  0  0            999 V2000\n    7.2406   -5.2304    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.5492   -5.6466    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.8292   -5.2323    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.1158   -5.6466    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.8292   -4.4239    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    7.9588   -5.6466    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    8.6721   -5.2323    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    7.2406   -4.4513    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  3  4  1  0  0  0  0\n  3  5  2  0  0  0  0\n  1  6  1  0  0  0  0\n  6  7  1  0  0  0  0\n  1  8  2  0  0  0  0\nM  END",
        "smiles": "CC(=O)CC(=O)OC",
        "formula": "C5H8O3",
        "atropisomerism": "No",
        "charge": 0,
        "count": 1,
        "stereochemistry": "ACHIRAL",
        "defined_stereo": 0,
        "ez_centers": 0,
        "molecular_weight": "116.1154",
        "optical_activity": "NONE",
        "references": [
          "24bce95b-1745-4dab-89b7-35cd654a593f",
          "66369ed6-0239-4eef-889c-2b6f4904231b"
        ],
        "stereo_centers": 0
      },
      "modifications": {
        "uuid": "1e672029-f102-43ba-b876-5c62a4243d89"
      },
      "unii": "CW4I82QAX1"
    }
  ]
}