{
  "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": "6aa96b6c-3a0e-4cf5-b3b8-5f68ef72a78f",
          "code": "2002-22-4",
          "type": "PRIMARY",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=2002-22-4",
          "code_system": "CAS",
          "references": [
            "3b5ce775-3218-456a-9575-cf16cf484ba3",
            "4da232a1-32c4-4826-8e89-05ac7d3b7160"
          ]
        },
        {
          "uuid": "7f07f114-3665-4280-a91b-a4e71fcac0ab",
          "code": "217-899-2",
          "type": "PRIMARY",
          "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.016.273",
          "code_system": "ECHA (EC/EINECS)",
          "references": [
            "3b5ce775-3218-456a-9575-cf16cf484ba3"
          ]
        },
        {
          "uuid": "ac622b4b-a97f-44ae-89c3-59f940afff25",
          "code": "m10764",
          "comments": "Merck Index",
          "type": "PRIMARY",
          "url": "https://merckindex.rsc.org/monographs/m10764?q=authorize",
          "code_system": "MERCK INDEX",
          "references": [
            "3b5ce775-3218-456a-9575-cf16cf484ba3"
          ]
        },
        {
          "uuid": "49977028-1308-41d3-9dba-06285ae02af3",
          "code": "2733604",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/compound/2733604",
          "code_system": "PUBCHEM",
          "references": [
            "3b5ce775-3218-456a-9575-cf16cf484ba3"
          ]
        },
        {
          "uuid": "33ea53f0-b8a8-4619-afa9-b0857197562d",
          "code": "MH6EDB26P8",
          "type": "PRIMARY",
          "code_system": "FDA UNII"
        },
        {
          "uuid": "4eca39b2-0080-0a2a-a867-e4f1df634f28",
          "code": "DTXSID401021728",
          "type": "PRIMARY",
          "url": "https://comptox.epa.gov/dashboard/chemical/details/DTXSID401021728",
          "code_system": "EPA CompTox"
        }
      ],
      "substance_class": "chemical",
      "names": [
        {
          "uuid": "34f0d6cd-2dec-40d1-b4a1-1728254f23ba",
          "name": "1H-IMIDAZOLE-4-PROPANOIC ACID, .ALPHA.-AMINO-2,3-DIHYDRO-2-THIOXO-, (.ALPHA.S)-",
          "stdName": "1H-IMIDAZOLE-4-PROPANOIC ACID, .ALPHA.-AMINO-2,3-DIHYDRO-2-THIOXO-, (.ALPHA.S)-",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "823f41f3-2f3e-4d99-88f7-b7480f2f493c",
            "dc49e8d9-1531-4cd4-b173-03847c35d90b"
          ],
          "display_name": false
        },
        {
          "uuid": "971350d3-552e-4be6-93dc-2240b52d8c36",
          "name": "1H-IMIDAZOLE-4-PROPANOIC ACID, .ALPHA.-AMINO-2,3-DIHYDRO-2-THIOXO-, (S)-",
          "stdName": "1H-IMIDAZOLE-4-PROPANOIC ACID, .ALPHA.-AMINO-2,3-DIHYDRO-2-THIOXO-, (S)-",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "823f41f3-2f3e-4d99-88f7-b7480f2f493c",
            "dc49e8d9-1531-4cd4-b173-03847c35d90b"
          ],
          "display_name": false
        },
        {
          "uuid": "55ad3fa3-4b9d-4a43-8b26-5c876d5a73c8",
          "name": "2-THIOLHISTIDINE L-FORM [MI]",
          "stdName": "2-THIOLHISTIDINE L-FORM [MI]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "43c473ce-0cb6-4f04-b5e6-3ef32323d68d",
            "dc49e8d9-1531-4cd4-b173-03847c35d90b"
          ],
          "display_name": false
        },
        {
          "uuid": "ad9f8a79-0863-4dcd-b11b-d28d54a57ad4",
          "name": "HISTIDINE, 2-MERCAPTO-, L-",
          "stdName": "HISTIDINE, 2-MERCAPTO-, L-",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "823f41f3-2f3e-4d99-88f7-b7480f2f493c",
            "dc49e8d9-1531-4cd4-b173-03847c35d90b"
          ],
          "display_name": false
        },
        {
          "uuid": "959689db-f77e-4144-90df-46bcd00f0f4e",
          "name": "L-2-MERCAPTOHISTIDINE",
          "stdName": "L-2-MERCAPTOHISTIDINE",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "823f41f3-2f3e-4d99-88f7-b7480f2f493c",
            "dc49e8d9-1531-4cd4-b173-03847c35d90b"
          ],
          "display_name": false
        },
        {
          "uuid": "4babe35e-f4b3-4292-aa71-20cc649925ad",
          "name": "L-2-THIOLHISTIDINE",
          "stdName": "L-2-THIOLHISTIDINE",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "823f41f3-2f3e-4d99-88f7-b7480f2f493c",
            "dc49e8d9-1531-4cd4-b173-03847c35d90b"
          ],
          "display_name": false
        },
        {
          "uuid": "1c9a59e4-98bb-46e9-810a-c2f99542c532",
          "name": "L-2-THIOXOHISTIDINE",
          "stdName": "L-2-THIOXOHISTIDINE",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "823f41f3-2f3e-4d99-88f7-b7480f2f493c",
            "dc49e8d9-1531-4cd4-b173-03847c35d90b"
          ],
          "display_name": false
        },
        {
          "uuid": "787c71ef-68c0-4158-9003-399d39b53705",
          "name": "L-THIOHISTIDINE",
          "stdName": "L-THIOHISTIDINE",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "823f41f3-2f3e-4d99-88f7-b7480f2f493c",
            "dc49e8d9-1531-4cd4-b173-03847c35d90b"
          ],
          "display_name": false
        },
        {
          "uuid": "40348805-632d-40dc-8117-e416c635a14d",
          "name": "THIOHISTIDINE",
          "stdName": "THIOHISTIDINE",
          "type": "of",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "665711cf-cfec-43ab-ad93-c1b1c3d443d7",
            "dc49e8d9-1531-4cd4-b173-03847c35d90b",
            "fa839766-44c8-4b4f-a53a-1ac157c58bd3"
          ],
          "display_name": true,
          "domains": [
            "cosmetic"
          ],
          "name_orgs": [
            {
              "uuid": "68f2c63a-c060-42e0-850a-abf2ab5e16bf",
              "name_org": "INCI"
            }
          ]
        }
      ],
      "references": [
        {
          "uuid": "665711cf-cfec-43ab-ad93-c1b1c3d443d7",
          "citation": "PCPC-DB",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE",
            "AUTO_SELECTED"
          ]
        },
        {
          "uuid": "dc49e8d9-1531-4cd4-b173-03847c35d90b",
          "citation": "PERSONAL CARE PRODUCTS COUNCIL",
          "doc_type": "PERSONAL CARE PRODUCTS COUNCIL",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "823f41f3-2f3e-4d99-88f7-b7480f2f493c",
          "citation": "STN",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "43c473ce-0cb6-4f04-b5e6-3ef32323d68d",
          "citation": "MERCK",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "3b5ce775-3218-456a-9575-cf16cf484ba3",
          "citation": "SRS CODE IMPORT",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493391623000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "583de661-5f39-433b-95d0-ec718de5bfc5",
          "citation": "SRS import [MH6EDB26P8]",
          "url": "http://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=MH6EDB26P8",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493391623000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "7e490b42-be20-437b-9be4-7ce973e640c3",
          "citation": "http://www.tetrahedron.fr/page2/page5/thiohistidine.htm",
          "url": "http://www.tetrahedron.fr/page2/page5/thiohistidine.htm",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "fa839766-44c8-4b4f-a53a-1ac157c58bd3",
          "citation": "THIOHISTIDINE [INCI]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "4da232a1-32c4-4826-8e89-05ac7d3b7160",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        }
      ],
      "definition_type": "PRIMARY",
      "moieties": [
        {
          "uuid": "6d00750d-327b-42bc-b3ec-38a4a98240e0",
          "id": "6d00750d-327b-42bc-b3ec-38a4a98240e0",
          "molfile": "\n  Marvin  01132105402D          \n\n 12 12  0  0  1  0            999 V2000\n   11.8256   -8.5448    0.0000 C   0  0  1  0  0  0  0  0  0  2  0  0\n   11.8256   -9.3693    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n   11.1110   -8.1325    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   10.3963   -8.5448    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   10.3139   -9.3693    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    9.5168   -9.5342    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n    9.1045   -8.8196    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    8.2800   -8.7371    0.0000 S   0  0  0  0  0  0  0  0  0  0  0  0\n    9.6542   -8.2149    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n   12.5402   -8.1325    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   12.5402   -7.3079    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n   13.2549   -8.5448    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n  1  2  1  1  0  0  0\n  1  3  1  0  0  0  0\n 10  1  1  0  0  0  0\n  4  3  1  0  0  0  0\n  4  5  2  0  0  0  0\n  9  4  1  0  0  0  0\n  5  6  1  0  0  0  0\n  7  6  1  0  0  0  0\n  7  8  2  0  0  0  0\n  7  9  1  0  0  0  0\n 10 11  1  0  0  0  0\n 10 12  2  0  0  0  0\nM  END",
          "smiles": "C(c1c[nH]c(=S)[nH]1)[C@@H](C(=O)O)N",
          "formula": "C6H9N3O2S",
          "atropisomerism": "No",
          "charge": 0,
          "count": 1,
          "stereochemistry": "ABSOLUTE",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "f122217f-7820-4f9b-b8be-349a613dc537"
          },
          "defined_stereo": 1,
          "ez_centers": 0,
          "molecular_weight": "187.2209",
          "optical_activity": "UNSPECIFIED",
          "stereo_centers": 1
        }
      ],
      "definition_level": "COMPLETE",
      "uuid": "9dc84484-0ef4-4ce6-8b1e-a526bb3c9d57",
      "version": "6",
      "structure": {
        "id": "9a138b0e-eb86-4d3b-8d23-cf77ebebe2e9",
        "molfile": "\n  Marvin  01132108002D          \n\n 12 12  0  0  1  0            999 V2000\n    9.1045   -8.8196    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    9.6542   -8.2149    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n   10.3963   -8.5448    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   10.3139   -9.3693    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    9.5168   -9.5342    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n   11.1110   -8.1325    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   11.8256   -8.5448    0.0000 C   0  0  1  0  0  0  0  0  0  0  0  0\n   12.5402   -8.1325    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   12.5402   -7.3079    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n   13.2549   -8.5448    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n   11.8256   -9.3693    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n    8.2800   -8.7371    0.0000 S   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  2  0  0  0  0\n  4  5  1  0  0  0  0\n  1  5  1  0  0  0  0\n  3  6  1  0  0  0  0\n  7  6  1  0  0  0  0\n  8  7  1  0  0  0  0\n  8  9  2  0  0  0  0\n  8 10  1  0  0  0  0\n  7 11  1  1  0  0  0\n  1 12  2  0  0  0  0\nM  END",
        "smiles": "C(c1c[nH]c(=S)[nH]1)[C@@H](C(=O)O)N",
        "formula": "C6H9N3O2S",
        "atropisomerism": "No",
        "charge": 0,
        "count": 1,
        "stereochemistry": "ABSOLUTE",
        "defined_stereo": 1,
        "ez_centers": 0,
        "molecular_weight": "187.2209",
        "optical_activity": "UNSPECIFIED",
        "references": [
          "583de661-5f39-433b-95d0-ec718de5bfc5",
          "7e490b42-be20-437b-9be4-7ce973e640c3"
        ],
        "stereo_centers": 1
      },
      "unii": "MH6EDB26P8"
    }
  ]
}