{
  "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": "a42de924-6c4d-41e6-9b91-41d17d9f3b70",
          "code": "3374-22-9",
          "type": "PRIMARY",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=3374-22-9",
          "code_system": "CAS",
          "references": [
            "5865d40d-96c5-43b5-9b9d-4b31b11833d2",
            "05a18a24-28ac-4bd3-97aa-2544b5efe364"
          ]
        },
        {
          "uuid": "41ce8c07-b028-4e35-b95c-4a3b579fc672",
          "code": "222-160-2",
          "type": "PRIMARY",
          "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.020.147",
          "code_system": "ECHA (EC/EINECS)",
          "references": [
            "5865d40d-96c5-43b5-9b9d-4b31b11833d2"
          ]
        },
        {
          "uuid": "984a3935-aa1b-4e9d-a618-6ecc310a0260",
          "code": "1313188",
          "comments": "RxNorm",
          "type": "PRIMARY",
          "url": "https://rxnav.nlm.nih.gov/REST/rxcui/1313188/allProperties.xml?prop=all",
          "code_system": "RXCUI",
          "references": [
            "5865d40d-96c5-43b5-9b9d-4b31b11833d2"
          ]
        },
        {
          "uuid": "46bfd9bf-471e-4bed-bf88-7bbe4aa42fa8",
          "code": "594",
          "type": "PRIMARY",
          "url": "https://pubchem.ncbi.nlm.nih.gov/compound/594",
          "code_system": "PUBCHEM",
          "references": [
            "5865d40d-96c5-43b5-9b9d-4b31b11833d2"
          ]
        },
        {
          "uuid": "47c20559-c49c-a1ba-b209-ef5cd819a68e",
          "code": "DTXSID5046988",
          "type": "PRIMARY",
          "url": "https://comptox.epa.gov/dashboard/chemical/details/DTXSID5046988",
          "code_system": "EPA CompTox",
          "references": [
            "d0de07d9-e521-36db-8261-d90f3d9787ae"
          ]
        },
        {
          "uuid": "4dbbddd3-89cb-463f-94cf-03edb9f0ca0a",
          "code": "5CM45Q5YAF",
          "type": "PRIMARY",
          "code_system": "FDA UNII"
        },
        {
          "uuid": "5e07d09e-3dd0-1eff-4620-8327b81d1a06",
          "code": "63864",
          "type": "PRIMARY",
          "url": "https://dtp.cancer.gov/dtpstandard/servlet/dwindex?searchtype=NSC&outputformat=html&searchlist=63864",
          "code_system": "NSC",
          "references": [
            "56755ff3-29c7-7445-4199-ac324ec00609"
          ]
        },
        {
          "uuid": "c58899ff-91b7-bedb-5c6c-3fc421f0bf61",
          "code": "5CM45Q5YAF",
          "type": "PRIMARY",
          "url": "https://dailymed.nlm.nih.gov/dailymed/search.cfm?adv=1&query=5CM45Q5YAF",
          "code_system": "DAILYMED",
          "references": [
            "d852be44-7631-e009-0a73-b494b7db7957"
          ]
        }
      ],
      "substance_class": "chemical",
      "names": [
        {
          "uuid": "abe98970-19ca-463d-8581-ac2eb069c591",
          "name": "(±)-2-AMINO-3-MERCAPTOPROPIONIC ACID",
          "stdName": "(+/-)-2-AMINO-3-MERCAPTOPROPIONIC ACID",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "9ecacbc8-d920-4e28-b372-512b29d0f284",
            "680671f2-a2d8-4bf8-9788-b6b8db302836"
          ],
          "display_name": false
        },
        {
          "uuid": "4c9e708c-5573-41f6-b777-82c5448fcc9b",
          "name": "CYSTEINE, DL-",
          "stdName": "CYSTEINE, DL-",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "9ecacbc8-d920-4e28-b372-512b29d0f284",
            "680671f2-a2d8-4bf8-9788-b6b8db302836",
            "38b85b1a-9ae0-4199-a980-8385182b0bb1"
          ],
          "display_name": true
        },
        {
          "uuid": "b8e9629e-58f1-497c-9b01-0ccbdd61714f",
          "name": "CYSTEINE, DL- [II]",
          "stdName": "CYSTEINE, DL- [II]",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "9ecacbc8-d920-4e28-b372-512b29d0f284",
            "680671f2-a2d8-4bf8-9788-b6b8db302836"
          ],
          "display_name": false
        },
        {
          "uuid": "a0927179-254e-4f8f-ad79-9dfeec6cf062",
          "name": "DL-CYSTEINE",
          "stdName": "DL-CYSTEINE",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "9ecacbc8-d920-4e28-b372-512b29d0f284",
            "680671f2-a2d8-4bf8-9788-b6b8db302836"
          ],
          "display_name": false
        },
        {
          "uuid": "dc5e1926-d954-40eb-94e1-a8aa2bea2ec4",
          "name": "NSC-63864",
          "stdName": "NSC-63864",
          "type": "cd",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "680671f2-a2d8-4bf8-9788-b6b8db302836",
            "239fd0df-cfcc-408c-8f90-f380c0dd6c78"
          ],
          "display_name": false
        }
      ],
      "references": [
        {
          "uuid": "9ecacbc8-d920-4e28-b372-512b29d0f284",
          "citation": "SA",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE",
            "AUTO_SELECTED"
          ]
        },
        {
          "uuid": "680671f2-a2d8-4bf8-9788-b6b8db302836",
          "citation": "SIGMA-ALDRICH",
          "doc_type": "SIGMA-ALDRICH",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "239fd0df-cfcc-408c-8f90-f380c0dd6c78",
          "citation": "CHEMID",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "5865d40d-96c5-43b5-9b9d-4b31b11833d2",
          "citation": "SRS CODE IMPORT",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493390900000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "7d3f996c-4e78-4b3f-b3e3-cad5e38f4a77",
          "citation": "SRS import [5CM45Q5YAF]",
          "url": "http://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=5CM45Q5YAF",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493390900000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "38b85b1a-9ae0-4199-a980-8385182b0bb1",
          "citation": "CYSTEINE, DL- [II]",
          "doc_type": "SRS_LOCATOR",
          "public_domain": true
        },
        {
          "uuid": "d0de07d9-e521-36db-8261-d90f3d9787ae",
          "citation": "WEBSITE",
          "url": "https://comptox.epa.gov/dashboard/dsstoxdb/results?utf8=%E2%9C%93&search=3374-22-9",
          "doc_type": "WEBSITE",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE"
          ]
        },
        {
          "uuid": "05a18a24-28ac-4bd3-97aa-2544b5efe364",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        },
        {
          "uuid": "56755ff3-29c7-7445-4199-ac324ec00609",
          "citation": "NCI",
          "doc_type": "NCI DRUG DICTIONARY",
          "public_domain": true
        },
        {
          "uuid": "d852be44-7631-e009-0a73-b494b7db7957",
          "citation": "DailyMed",
          "doc_type": "DAILYMED",
          "public_domain": true
        }
      ],
      "definition_type": "PRIMARY",
      "moieties": [
        {
          "uuid": "c667b165-35bf-4abb-bdc3-43b59161840b",
          "id": "c667b165-35bf-4abb-bdc3-43b59161840b",
          "molfile": "\n  Marvin  01132110152D          \n\n  7  6  0  0  0  0            999 V2000\n    5.3121   -3.8275    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n    5.7413   -3.0453    0.0000 C   0  0  0  0  0  0  0  0  0  3  0  0\n    5.3121   -2.3443    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    4.4489   -2.3443    0.0000 S   0  0  0  0  0  0  0  0  0  0  0  0\n    6.5663   -3.0453    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    6.9908   -2.3443    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    7.0242   -3.8036    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  2  5  1  0  0  0  0\n  4  3  1  0  0  0  0\n  6  5  1  0  0  0  0\n  7  5  2  0  0  0  0\nM  END",
          "smiles": "C(C(C(=O)O)N)S",
          "formula": "C3H7NO2S",
          "atropisomerism": "No",
          "charge": 0,
          "count": 1,
          "stereochemistry": "RACEMIC",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "cc2477a9-7aec-482c-a516-a2a1985d2021"
          },
          "defined_stereo": 0,
          "ez_centers": 0,
          "molecular_weight": "121.1594",
          "optical_activity": "( + / - )",
          "stereo_centers": 1
        }
      ],
      "definition_level": "COMPLETE",
      "uuid": "7a6f83f1-185e-4c19-b73f-f68af803f918",
      "version": "5",
      "structure": {
        "id": "4707d34b-1d93-49e7-b810-afb4f0ac5cb1",
        "molfile": "\n  Marvin  01132103442D          \n\n  7  6  0  0  0  0            999 V2000\n    6.5663   -3.0453    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.7413   -3.0453    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.3121   -3.8275    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n    5.3121   -2.3443    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    4.4489   -2.3443    0.0000 S   0  0  0  0  0  0  0  0  0  0  0  0\n    6.9908   -2.3443    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    7.0242   -3.8036    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n  2  1  1  0  0  0  0\n  2  3  1  0  0  0  0\n  4  2  1  0  0  0  0\n  5  4  1  0  0  0  0\n  6  1  1  0  0  0  0\n  7  1  2  0  0  0  0\nM  END",
        "smiles": "C(C(C(=O)O)N)S",
        "formula": "C3H7NO2S",
        "atropisomerism": "No",
        "charge": 0,
        "count": 1,
        "stereochemistry": "RACEMIC",
        "defined_stereo": 0,
        "ez_centers": 0,
        "molecular_weight": "121.1594",
        "optical_activity": "( + / - )",
        "references": [
          "9ecacbc8-d920-4e28-b372-512b29d0f284",
          "7d3f996c-4e78-4b3f-b3e3-cad5e38f4a77"
        ],
        "stereo_centers": 1
      },
      "unii": "5CM45Q5YAF"
    }
  ]
}