{
  "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": "168db784-e388-446e-b03c-94cc81ef15f8",
          "code": "115-11-7",
          "type": "PRIMARY",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=115-11-7",
          "code_system": "CAS",
          "references": [
            "6a6613d5-2aa3-4fc3-a2be-f1d8419a89b3",
            "8bee3755-37a8-416f-ae5f-344201509c30"
          ]
        },
        {
          "uuid": "e51d20ce-ea10-49a8-b381-f032ecc13a7f",
          "code": "C008176",
          "type": "PRIMARY",
          "url": "http://www.ncbi.nlm.nih.gov/mesh/67008176",
          "code_system": "MESH",
          "references": [
            "6a6613d5-2aa3-4fc3-a2be-f1d8419a89b3"
          ]
        },
        {
          "uuid": "4e8c1e77-382c-4914-994e-87051700c673",
          "code": "ISOBUTYLENE",
          "type": "PRIMARY",
          "url": "https://en.wikipedia.org/wiki/Isobutylene",
          "code_system": "WIKIPEDIA",
          "references": [
            "6a6613d5-2aa3-4fc3-a2be-f1d8419a89b3"
          ]
        },
        {
          "uuid": "76c49bae-670f-4196-9569-0884891a2f1a",
          "code": "204-066-3",
          "type": "PRIMARY",
          "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.003.697",
          "code_system": "ECHA (EC/EINECS)",
          "references": [
            "6a6613d5-2aa3-4fc3-a2be-f1d8419a89b3"
          ]
        },
        {
          "uuid": "0e1ca88f-90cc-4773-809a-3d4830a131d0",
          "code": "m6456",
          "comments": "Merck Index",
          "type": "PRIMARY",
          "url": "https://merckindex.rsc.org/monographs/m6456?q=authorize",
          "code_system": "MERCK INDEX",
          "references": [
            "6a6613d5-2aa3-4fc3-a2be-f1d8419a89b3"
          ]
        },
        {
          "uuid": "dfd2a537-6d59-44f1-8dce-f755fc8292fa",
          "code": "SUB35584",
          "type": "PRIMARY",
          "code_system": "EVMPD",
          "references": [
            "6a6613d5-2aa3-4fc3-a2be-f1d8419a89b3"
          ]
        },
        {
          "uuid": "2476f0c4-1ba6-44ed-8bd3-6662e9a148bf",
          "code": "8255",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/compound/8255",
          "code_system": "PUBCHEM",
          "references": [
            "6a6613d5-2aa3-4fc3-a2be-f1d8419a89b3"
          ]
        },
        {
          "uuid": "8091b4a9-5ae2-c528-6b60-4e780e646529",
          "code": "613",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/source/hsdb/613",
          "code_system": "HSDB",
          "references": [
            "8b5f3f8c-2c18-a6b5-5dcf-45d3a493a1e2"
          ]
        },
        {
          "uuid": "db242a6c-21a0-b7bb-4ef4-907af4370d91",
          "code": "DTXSID9020748",
          "type": "PRIMARY",
          "url": "https://comptox.epa.gov/dashboard/chemical/details/DTXSID9020748",
          "code_system": "EPA CompTox",
          "references": [
            "307cdd07-4e2b-4c04-897d-f032d98c08a9"
          ]
        },
        {
          "uuid": "a90770c4-c2ef-06d3-aeb9-98a710142dd9",
          "code": "2099712",
          "type": "PRIMARY",
          "url": "https://rxnav.nlm.nih.gov/REST/rxcui/2099712/allProperties.xml?prop=all",
          "code_system": "RXCUI",
          "references": [
            "596ed610-cdcd-74b5-edb4-7c1d21c75db7"
          ]
        },
        {
          "uuid": "b366f0db-71b3-4e71-8f59-6c468fb25257",
          "code": "QA2LMR467H",
          "type": "PRIMARY",
          "code_system": "FDA UNII"
        },
        {
          "uuid": "e1c1fb42-7fc5-efd7-e081-0391602160eb",
          "code": "43907",
          "type": "PRIMARY",
          "url": "https://www.ebi.ac.uk/chebi/chebiOntology.do?chebiId=CHEBI:43907",
          "code_system": "CHEBI",
          "references": [
            "d75f4ec3-32b9-f362-563d-762f45ae8f38"
          ]
        },
        {
          "uuid": "007d0d37-0d3b-d93c-c552-e139122cb5c2",
          "code": "100000128502",
          "type": "PRIMARY",
          "code_system": "SMS_ID",
          "references": [
            "f1c488dc-69cc-3d51-cc92-d2c49c6bd21d"
          ]
        },
        {
          "uuid": "ba1d406d-be11-e0f4-fdc7-756319e5ae47",
          "code": "QA2LMR467H",
          "type": "PRIMARY",
          "url": "https://dailymed.nlm.nih.gov/dailymed/search.cfm?adv=1&query=QA2LMR467H",
          "code_system": "DAILYMED",
          "references": [
            "204377ef-9975-a5e6-1a18-4238dbf5ece1"
          ]
        }
      ],
      "substance_class": "chemical",
      "names": [
        {
          "uuid": "c3e87855-a171-4f55-9b21-66e78d307d59",
          "name": "2-METHYL-1-PROPENE",
          "stdName": "2-METHYL-1-PROPENE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "887653d5-6347-4928-8819-5600eed07f6c",
            "a4d2a48b-3d7a-4b9a-aca9-7e51b6cd69f1"
          ],
          "display_name": false
        },
        {
          "uuid": "35da5a42-f571-42e2-965a-c8be72fe5286",
          "name": "ISOBUTENE",
          "stdName": "ISOBUTENE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "887653d5-6347-4928-8819-5600eed07f6c",
            "a4d2a48b-3d7a-4b9a-aca9-7e51b6cd69f1"
          ],
          "display_name": false
        },
        {
          "uuid": "3f6a3f0e-1965-47b4-8a1c-938003d6a14d",
          "name": "ISOBUTYLENE [HSDB]",
          "stdName": "ISOBUTYLENE [HSDB]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "10a4ed35-4a34-40ed-a717-a2d9ffefebb4",
            "a4d2a48b-3d7a-4b9a-aca9-7e51b6cd69f1"
          ],
          "display_name": false
        },
        {
          "uuid": "7195d174-834b-4aed-86b2-0d2db052cde8",
          "name": "ISOBUTYLENE [MI]",
          "stdName": "ISOBUTYLENE [MI]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "0b7670c8-5f2e-4486-bd84-99acabcdd83c",
            "a4d2a48b-3d7a-4b9a-aca9-7e51b6cd69f1"
          ],
          "display_name": false
        },
        {
          "uuid": "9c68bc9f-b9b2-4c91-b79d-23ed76bb242b",
          "name": "Isobutylene",
          "stdName": "ISOBUTYLENE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "2eef9d0f-b500-4834-bd5c-66a9e93ef882",
            "10a4ed35-4a34-40ed-a717-a2d9ffefebb4",
            "0b7670c8-5f2e-4486-bd84-99acabcdd83c",
            "7a93f770-0315-4446-8a54-7c3470240dea",
            "ba7fc533-05e6-48f1-a9d5-7b314e3cff93",
            "5c801fdc-8f5a-4fa7-9492-9cf4a297c5e0",
            "887653d5-6347-4928-8819-5600eed07f6c",
            "a4d2a48b-3d7a-4b9a-aca9-7e51b6cd69f1"
          ],
          "display_name": true
        },
        {
          "uuid": "40e0d583-f986-17fb-a56d-494d14d3b676",
          "name": "Isobutylene [WHO-DD]",
          "stdName": "ISOBUTYLENE [WHO-DD]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "b304de87-e203-c914-2d63-58efe14665f7"
          ],
          "display_name": false
        }
      ],
      "references": [
        {
          "uuid": "7a93f770-0315-4446-8a54-7c3470240dea",
          "citation": "ISOBUTYLENE [WHO-DD]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "887653d5-6347-4928-8819-5600eed07f6c",
          "citation": "MERCK",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE",
            "AUTO_SELECTED"
          ]
        },
        {
          "uuid": "a4d2a48b-3d7a-4b9a-aca9-7e51b6cd69f1",
          "citation": "MERCK INDEX",
          "doc_type": "MERCK INDEX",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "0b7670c8-5f2e-4486-bd84-99acabcdd83c",
          "citation": "MERCK INDEX",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "10a4ed35-4a34-40ed-a717-a2d9ffefebb4",
          "citation": "HSDB",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "5c801fdc-8f5a-4fa7-9492-9cf4a297c5e0",
          "citation": "WHO-DD",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "6a6613d5-2aa3-4fc3-a2be-f1d8419a89b3",
          "citation": "SRS CODE IMPORT",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493390909000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "ea8f1ade-e3be-4a26-ad9e-6fdd93d252da",
          "citation": "SRS import [QA2LMR467H]",
          "url": "http://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=QA2LMR467H",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493390909000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "2eef9d0f-b500-4834-bd5c-66a9e93ef882",
          "citation": "ISOBUTYLENE [MI]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "ba7fc533-05e6-48f1-a9d5-7b314e3cff93",
          "citation": "ISOBUTYLENE [HSDB]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "8b5f3f8c-2c18-a6b5-5dcf-45d3a493a1e2",
          "citation": "WEBSITE",
          "url": "https://toxnet.nlm.nih.gov/cgi-bin/sis/search2/r?dbs+hsdb:@term+@rn+@rel+115-11-7",
          "doc_type": "WEBSITE",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "307cdd07-4e2b-4c04-897d-f032d98c08a9",
          "citation": "WEBSITE",
          "url": "https://comptox.epa.gov/dashboard/dsstoxdb/results?utf8=%E2%9C%93&search=115-11-7",
          "doc_type": "WEBSITE",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "596ed610-cdcd-74b5-edb4-7c1d21c75db7",
          "citation": "RXNORM",
          "doc_type": "NLM",
          "public_domain": true
        },
        {
          "uuid": "8bee3755-37a8-416f-ae5f-344201509c30",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        },
        {
          "uuid": "d75f4ec3-32b9-f362-563d-762f45ae8f38",
          "doc_type": "SYSTEM",
          "public_domain": true
        },
        {
          "uuid": "b304de87-e203-c914-2d63-58efe14665f7",
          "citation": "WHO-DD",
          "doc_type": "WHO DRUG DICTIONARY",
          "public_domain": true
        },
        {
          "uuid": "204377ef-9975-a5e6-1a18-4238dbf5ece1",
          "citation": "DailyMed",
          "doc_type": "DAILYMED",
          "public_domain": true
        },
        {
          "uuid": "f1c488dc-69cc-3d51-cc92-d2c49c6bd21d",
          "citation": "EU-SRS",
          "doc_type": "EMA LIST",
          "public_domain": true
        }
      ],
      "definition_type": "PRIMARY",
      "moieties": [
        {
          "uuid": "a505670b-8ef6-4ddb-aea2-130bf4805875",
          "id": "a505670b-8ef6-4ddb-aea2-130bf4805875",
          "molfile": "\n  CDK     10182415032D\n\n  4  3  0  0  0  0  0  0  0  0999 V2000\n   24.6990   -8.8660    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   23.3479   -8.0860    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   21.9970   -8.8660    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   23.3479   -6.5260    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  2  4  1  0  0  0  0\nM  END",
          "smiles": "C=C(C)C",
          "formula": "C4H8",
          "atropisomerism": "No",
          "charge": 0,
          "count": 1,
          "stereochemistry": "ACHIRAL",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "0d28fe0c-33c1-40c4-9686-82e7b521cc35"
          },
          "defined_stereo": 0,
          "ez_centers": 0,
          "molecular_weight": "56.1065",
          "optical_activity": "NONE",
          "stereo_centers": 0
        }
      ],
      "definition_level": "COMPLETE",
      "uuid": "6789212e-f4a0-407b-8d3e-37e3876d4dfe",
      "version": "15",
      "structure": {
        "id": "b13803ad-cb35-456d-938d-6820b2b0d2bc",
        "molfile": "\n   JSDraw210182415032D\n\n  4  3  0  0  0  0              0 V2000\n   24.6990   -8.8660    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   23.3479   -8.0860    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   21.9970   -8.8660    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   23.3479   -6.5260    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  2  4  1  0  0  0  0\nM  END",
        "smiles": "C=C(C)C",
        "formula": "C4H8",
        "atropisomerism": "No",
        "charge": 0,
        "count": 1,
        "stereochemistry": "ACHIRAL",
        "defined_stereo": 0,
        "ez_centers": 0,
        "molecular_weight": "56.1065",
        "optical_activity": "NONE",
        "references": [
          "ea8f1ade-e3be-4a26-ad9e-6fdd93d252da",
          "887653d5-6347-4928-8819-5600eed07f6c"
        ],
        "stereo_centers": 0
      },
      "modifications": {
        "uuid": "2aea4d50-3f1a-4d0b-8da6-2309149f205b"
      },
      "unii": "QA2LMR467H"
    }
  ]
}