{
  "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": "2026-09-09",
    "results": {
      "skip": 0,
      "limit": 1,
      "total": 1
    }
  },
  "results": [
    {
      "codes": [
        {
          "uuid": "dd26085d-47c4-42e4-8677-5ae73ad7ac16",
          "code": "62-50-0",
          "type": "PRIMARY",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=62-50-0",
          "code_system": "CAS",
          "references": [
            "a5fd33d0-5ef7-4fd1-a433-81b316668fbe",
            "d1540cab-ec14-4770-a2cb-3dec2ed95052"
          ]
        },
        {
          "uuid": "878be126-a884-4981-8b77-2603f96dad02",
          "code": "C29820",
          "type": "PRIMARY",
          "url": "https://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C29820",
          "code_system": "NCI_THESAURUS",
          "references": [
            "a5fd33d0-5ef7-4fd1-a433-81b316668fbe"
          ]
        },
        {
          "uuid": "605bdcfe-4029-4715-ac3a-49ec1821dcf5",
          "code": "D005020",
          "type": "PRIMARY",
          "url": "http://www.ncbi.nlm.nih.gov/mesh/68005020",
          "code_system": "MESH",
          "references": [
            "a5fd33d0-5ef7-4fd1-a433-81b316668fbe"
          ]
        },
        {
          "uuid": "02c80f7e-3c36-4169-bbe3-c2d603a56e9f",
          "code": "ETHYL METHANESULFONATE",
          "type": "PRIMARY",
          "url": "https://en.wikipedia.org/wiki/Ethyl_methanesulfonate",
          "code_system": "WIKIPEDIA",
          "references": [
            "a5fd33d0-5ef7-4fd1-a433-81b316668fbe"
          ]
        },
        {
          "uuid": "33ccd95c-99c2-4d7a-b906-8ad9f988aea7",
          "code": "m5152",
          "comments": "Merck Index",
          "type": "PRIMARY",
          "url": "https://merckindex.rsc.org/monographs/m5152?q=authorize",
          "code_system": "MERCK INDEX",
          "references": [
            "a5fd33d0-5ef7-4fd1-a433-81b316668fbe"
          ]
        },
        {
          "uuid": "a9e575f8-5986-4c8c-8465-ae5e0cf7b3bc",
          "code": "200-536-7",
          "type": "PRIMARY",
          "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.000.488",
          "code_system": "ECHA (EC/EINECS)",
          "references": [
            "a5fd33d0-5ef7-4fd1-a433-81b316668fbe"
          ]
        },
        {
          "uuid": "8d55b270-fd4a-4d24-a82a-8c6ea8d2e021",
          "code": "6113",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/compound/6113",
          "code_system": "PUBCHEM",
          "references": [
            "a5fd33d0-5ef7-4fd1-a433-81b316668fbe"
          ]
        },
        {
          "uuid": "841cc982-97dd-a6d1-4e95-b0fff0d144d8",
          "code": "4007",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/source/hsdb/4007",
          "code_system": "HSDB",
          "references": [
            "da5fa7d6-6c4f-9c2f-edf4-95558e31fe75"
          ]
        },
        {
          "uuid": "865045da-c9e0-9706-2448-94b9c4a76b91",
          "code": "DTXSID6025309",
          "type": "PRIMARY",
          "url": "https://comptox.epa.gov/dashboard/chemical/details/DTXSID6025309",
          "code_system": "EPA CompTox",
          "references": [
            "7eb64ca7-81bf-9c5e-5f56-1267367b11c1"
          ]
        },
        {
          "uuid": "0479a01d-24fd-f3db-017e-2ce56269aeae",
          "code": "Ethyl methanesulfonate",
          "comments": "IARC|GROUP 2B (Possibly carcinogenic to humans)",
          "type": "PRIMARY",
          "code_system": "IARC",
          "references": [
            "42bf6db5-4b5b-2a7c-8d60-8d213d621b82"
          ]
        },
        {
          "uuid": "716dd9e8-2cb7-278b-b4e2-13a9e4375b04",
          "code": "C45175",
          "comments": "Chemical Modifier[C1932]|Carcinogen[C347]|Chemical Carcinogen[C1743]|Organic Carcinogen",
          "type": "CONCEPT",
          "url": "https://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C45175",
          "code_system": "NCI_THESAURUS",
          "references": [
            "68124890-c69d-ee7e-0ed5-c64b08a80d5a"
          ]
        },
        {
          "uuid": "80a03500-e600-421a-a42f-5121461fd0dc",
          "code": "9H154DI0UP",
          "type": "PRIMARY",
          "code_system": "FDA UNII"
        },
        {
          "uuid": "b18bbd4a-f0a2-ade4-d1fd-cab44a533abf",
          "code": "23994",
          "type": "PRIMARY",
          "url": "https://www.ebi.ac.uk/chebi/chebiOntology.do?chebiId=CHEBI:23994",
          "code_system": "CHEBI",
          "references": [
            "68124890-c69d-ee7e-0ed5-c64b08a80d5a"
          ]
        },
        {
          "uuid": "965cc62c-d55f-72e5-9b77-1c64f9d8d4c9",
          "code": "26805",
          "type": "PRIMARY",
          "url": "https://dtp.cancer.gov/dtpstandard/servlet/dwindex?searchtype=NSC&outputformat=html&searchlist=26805",
          "code_system": "NSC",
          "references": [
            "fd5d1569-540f-5e35-f609-1827e1cf0dfa"
          ]
        },
        {
          "uuid": "4734a1f8-bd14-2d74-6ff5-ec44f30f089f",
          "code": "300000053329",
          "type": "PRIMARY",
          "code_system": "SMS_ID",
          "references": [
            "dd9a50d1-233e-6c5a-5af2-308b0c228816"
          ]
        }
      ],
      "substance_class": "chemical",
      "names": [
        {
          "uuid": "e181e09a-3e69-4c4c-baf9-d316eaaa66f1",
          "name": "EMS",
          "stdName": "EMS",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "d97da39f-0f2d-43ec-8800-64824e16360e",
            "e336e5e8-b325-4439-8c93-491ecffafad2"
          ],
          "display_name": false
        },
        {
          "uuid": "2465d09f-daba-49f4-9e04-d1c4c50d4e3a",
          "name": "Ethyl methanesulfonate",
          "stdName": "ETHYL METHANESULFONATE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "d97da39f-0f2d-43ec-8800-64824e16360e",
            "a609dcb0-8e00-4a1f-ad93-802e0f57131c",
            "078a36b3-1580-4ab3-9fe4-10affabf2bcd",
            "22678cf0-9916-448c-894a-476701f5745f",
            "5784ce1f-825c-4f00-a849-6d6329563490",
            "2291dab0-9ed9-4a20-a97a-1833546c0371"
          ],
          "display_name": true
        },
        {
          "uuid": "6736d385-4e26-401c-8703-d63133530c12",
          "name": "Ethyl methanesulfonate [HSDB]",
          "stdName": "ETHYL METHANESULFONATE [HSDB]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "d97da39f-0f2d-43ec-8800-64824e16360e",
            "2291dab0-9ed9-4a20-a97a-1833546c0371"
          ],
          "display_name": false
        },
        {
          "uuid": "58139546-55da-2f5b-680a-6e0db3c90c66",
          "name": "Ethyl methanesulfonate [IARC]",
          "stdName": "ETHYL METHANESULFONATE [IARC]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "42bf6db5-4b5b-2a7c-8d60-8d213d621b82"
          ],
          "display_name": false
        },
        {
          "uuid": "2b96fe1b-b749-47d7-9a65-5bd8bd96ccd7",
          "name": "Ethyl methanesulfonate [MI]",
          "stdName": "ETHYL METHANESULFONATE [MI]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "d97da39f-0f2d-43ec-8800-64824e16360e",
            "5784ce1f-825c-4f00-a849-6d6329563490"
          ],
          "display_name": false
        },
        {
          "uuid": "be70404a-c7da-45f3-93d6-56dafb5efe54",
          "name": "Ethyl methanesulphonate",
          "stdName": "ETHYL METHANESULPHONATE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "8897165b-280f-4b76-81fd-9e075751265c"
          ],
          "display_name": false
        },
        {
          "uuid": "9add82f0-92fb-44cf-aa3f-4597393c66e5",
          "name": "NSC-26805",
          "stdName": "NSC-26805",
          "type": "cd",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "d97da39f-0f2d-43ec-8800-64824e16360e",
            "e336e5e8-b325-4439-8c93-491ecffafad2"
          ],
          "display_name": false
        }
      ],
      "references": [
        {
          "uuid": "078a36b3-1580-4ab3-9fe4-10affabf2bcd",
          "citation": "ICSAS BATCH 2010",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE",
            "AUTO_SELECTED"
          ]
        },
        {
          "uuid": "8897165b-280f-4b76-81fd-9e075751265c",
          "citation": "FDA-SRS 2010",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "5784ce1f-825c-4f00-a849-6d6329563490",
          "citation": "MERCK INDEX",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "d97da39f-0f2d-43ec-8800-64824e16360e",
          "citation": "MERCK INDEX",
          "doc_type": "MERCK INDEX",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "2291dab0-9ed9-4a20-a97a-1833546c0371",
          "citation": "HSDB",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "e336e5e8-b325-4439-8c93-491ecffafad2",
          "citation": "SCIFINDER",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "a5fd33d0-5ef7-4fd1-a433-81b316668fbe",
          "citation": "SRS CODE IMPORT",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493390878000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "9e76f02f-561e-485e-92eb-8e06ae9473b5",
          "citation": "SRS import [9H154DI0UP]",
          "url": "http://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=9H154DI0UP",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493390878000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "bfa0688d-a558-4d4b-8c64-192da2b67fea",
          "citation": "CHEMID 2010",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "a609dcb0-8e00-4a1f-ad93-802e0f57131c",
          "citation": "ETHYL METHANESULFONATE [MI]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "22678cf0-9916-448c-894a-476701f5745f",
          "citation": "ETHYL METHANESULFONATE [HSDB]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "da5fa7d6-6c4f-9c2f-edf4-95558e31fe75",
          "citation": "WEBSITE",
          "url": "https://toxnet.nlm.nih.gov/cgi-bin/sis/search2/r?dbs+hsdb:@term+@rn+@rel+62-50-0",
          "doc_type": "WEBSITE",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "7eb64ca7-81bf-9c5e-5f56-1267367b11c1",
          "citation": "WEBSITE",
          "url": "https://comptox.epa.gov/dashboard/dsstoxdb/results?utf8=%E2%9C%93&search=62-50-0",
          "doc_type": "WEBSITE",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "42bf6db5-4b5b-2a7c-8d60-8d213d621b82",
          "citation": "IARC",
          "doc_type": "IARC",
          "public_domain": true
        },
        {
          "uuid": "68124890-c69d-ee7e-0ed5-c64b08a80d5a",
          "doc_type": "SYSTEM",
          "public_domain": true
        },
        {
          "uuid": "d1540cab-ec14-4770-a2cb-3dec2ed95052",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        },
        {
          "uuid": "fd5d1569-540f-5e35-f609-1827e1cf0dfa",
          "citation": "NCI",
          "doc_type": "NCI DRUG DICTIONARY",
          "public_domain": true
        },
        {
          "uuid": "dd9a50d1-233e-6c5a-5af2-308b0c228816",
          "citation": "SMS",
          "doc_type": "EMA LIST",
          "public_domain": true
        }
      ],
      "definition_type": "PRIMARY",
      "moieties": [
        {
          "uuid": "f569c7cd-e836-4a53-bfe0-5bc9b608fd16",
          "id": "f569c7cd-e836-4a53-bfe0-5bc9b608fd16",
          "molfile": "\n  CDK     10182415192D\n\n  7  6  0  0  0  0  0  0  0  0999 V2000\n   21.2179   -6.9160    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   22.5690   -7.6960    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   23.9200   -6.9160    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n   25.2710   -7.6960    0.0000 S   0  0  0  0  0  0  0  0  0  0  0  0\n   26.6221   -8.4760    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n   26.0510   -6.3450    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n   24.4910   -9.0470    0.0000 C   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  4  5  2  0  0  0  0\n  4  6  2  0  0  0  0\n  4  7  1  0  0  0  0\nM  END",
          "smiles": "CCOS(=O)(=O)C",
          "formula": "C3H8O3S",
          "atropisomerism": "No",
          "charge": 0,
          "count": 1,
          "stereochemistry": "ACHIRAL",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "120225db-46f6-47fd-bda5-b8178ba96821"
          },
          "defined_stereo": 0,
          "ez_centers": 0,
          "molecular_weight": "124.16",
          "optical_activity": "NONE",
          "stereo_centers": 0
        }
      ],
      "definition_level": "COMPLETE",
      "uuid": "55efc6a3-1bdb-46e2-8e5e-38bb6f79c858",
      "version": "30",
      "structure": {
        "id": "d265a128-d780-4500-b1c0-1a92c4a264e3",
        "molfile": "\n   JSDraw210182415192D\n\n  7  6  0  0  0  0              0 V2000\n   21.2179   -6.9160    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   22.5690   -7.6960    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   23.9200   -6.9160    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n   25.2710   -7.6960    0.0000 S   0  0  0  0  0  0  0  0  0  0  0  0\n   26.6221   -8.4760    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n   26.0510   -6.3450    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n   24.4910   -9.0470    0.0000 C   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  4  5  2  0  0  0  0\n  4  6  2  0  0  0  0\n  4  7  1  0  0  0  0\nM  END",
        "smiles": "CCOS(=O)(=O)C",
        "formula": "C3H8O3S",
        "atropisomerism": "No",
        "charge": 0,
        "count": 1,
        "stereochemistry": "ACHIRAL",
        "defined_stereo": 0,
        "ez_centers": 0,
        "molecular_weight": "124.16",
        "optical_activity": "NONE",
        "references": [
          "9e76f02f-561e-485e-92eb-8e06ae9473b5",
          "bfa0688d-a558-4d4b-8c64-192da2b67fea"
        ],
        "stereo_centers": 0
      },
      "unii": "9H154DI0UP"
    }
  ]
}