{
  "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": "59ed5eb3-0f0b-4967-81ce-c2804206084d",
          "code": "6371-84-2",
          "type": "PRIMARY",
          "url": "https://commonchemistry.cas.org/detail?cas_rn=6371-84-2",
          "code_system": "CAS",
          "references": [
            "7de68285-d9f1-4c92-bf6c-b2ab14a60d65",
            "37db6c5c-3da6-4971-a780-814db289d5f0"
          ]
        },
        {
          "uuid": "74a563d1-6b99-4cbc-9d2f-122d55ed04a8",
          "code": "228-900-0",
          "type": "PRIMARY",
          "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.026.273",
          "code_system": "ECHA (EC/EINECS)",
          "references": [
            "7de68285-d9f1-4c92-bf6c-b2ab14a60d65"
          ]
        },
        {
          "uuid": "e7a083ec-4734-40d4-96fc-15c9078e4e4b",
          "code": "K870FJ9VYZ",
          "type": "PRIMARY",
          "code_system": "FDA UNII"
        },
        {
          "uuid": "2407c36f-75e5-171b-4577-e87169eb7f0f",
          "code": "DTXSID401014664",
          "type": "PRIMARY",
          "url": "https://comptox.epa.gov/dashboard/chemical/details/DTXSID401014664",
          "code_system": "EPA CompTox"
        }
      ],
      "substance_class": "chemical",
      "names": [
        {
          "uuid": "0db11503-b813-4160-a4d6-aeed9f920e99",
          "name": "BENZENESULFONIC ACID, 4-(2-(3-(2-(2,4-DIMETHYLPHENYL)DIAZENYL)-2,4-DIHYDROXYPHENYL)DIAZENYL)-, SODIUM SALT (1:1)",
          "stdName": "BENZENESULFONIC ACID, 4-(2-(3-(2-(2,4-DIMETHYLPHENYL)DIAZENYL)-2,4-DIHYDROXYPHENYL)DIAZENYL)-, SODIUM SALT (1:1)",
          "type": "sys",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "820f3dc3-1a95-4d5b-b165-2813e77fd4a0",
            "16417310-b90e-4a35-b8bc-57ce096bb881"
          ],
          "display_name": false
        },
        {
          "uuid": "7cce1e59-5aba-4a7e-9674-63f2f5aa46b3",
          "name": "SODIUM 4-((3-((2,4-DIMETHYLPHENYL)DIAZENYL)-2,4-DIHYDROXYPHENY)DIAZENYL)BENZENESULFONATE",
          "stdName": "SODIUM 4-((3-((2,4-DIMETHYLPHENYL)DIAZENYL)-2,4-DIHYDROXYPHENY)DIAZENYL)BENZENESULFONATE",
          "type": "cn",
          "languages": [
            "en"
          ],
          "preferred": false,
          "references": [
            "85be943c-25fe-47c8-9640-f0b2e999ba31",
            "076ccbc1-9a9e-45b5-b4c2-bd62dbae28a4"
          ],
          "display_name": true
        }
      ],
      "references": [
        {
          "uuid": "756cc9c1-c068-4541-90f5-ca69078f14e7",
          "citation": "21CFR74.2151",
          "doc_type": "CFR",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "85be943c-25fe-47c8-9640-f0b2e999ba31",
          "citation": "ACD 8.0(21CFR74.2151",
          "doc_type": "ACD",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "076ccbc1-9a9e-45b5-b4c2-bd62dbae28a4",
          "citation": "CFR",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN",
            "PUBLIC_DOMAIN_RELEASE",
            "AUTO_SELECTED"
          ]
        },
        {
          "uuid": "820f3dc3-1a95-4d5b-b165-2813e77fd4a0",
          "citation": "STN",
          "doc_type": "SRS",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "16417310-b90e-4a35-b8bc-57ce096bb881",
          "citation": "STN (SCIFINDER)",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "7de68285-d9f1-4c92-bf6c-b2ab14a60d65",
          "citation": "SRS CODE IMPORT",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493389952000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "c28c3e91-f569-4d8d-8821-a1475b6fb1bd",
          "citation": "SRS import [K870FJ9VYZ]",
          "url": "http://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=K870FJ9VYZ",
          "doc_type": "SRS",
          "public_domain": true,
          "document_date": 1493389952000,
          "tags": [
            "NOMEN"
          ]
        },
        {
          "uuid": "37db6c5c-3da6-4971-a780-814db289d5f0",
          "citation": "STN",
          "doc_type": "STN (SCIFINDER)",
          "public_domain": true
        }
      ],
      "definition_type": "PRIMARY",
      "moieties": [
        {
          "uuid": "b47436d1-093f-4332-a50c-859a87126e3e",
          "id": "b47436d1-093f-4332-a50c-859a87126e3e",
          "molfile": "\n  Marvin  01132109212D          \n\n  1  0  0  0  0  0            999 V2000\n    7.9366   -2.9714    0.0000 Na  0  3  0  0  0  0  0  0  0  0  0  0\nM  CHG  1   1   1\nM  END",
          "smiles": "[Na+]",
          "formula": "Na",
          "atropisomerism": "No",
          "charge": 1,
          "count": 1,
          "stereochemistry": "ACHIRAL",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "fdd47cf3-b7d1-41ec-bcb3-8283408564c7"
          },
          "defined_stereo": 0,
          "ez_centers": 0,
          "molecular_weight": "22.9898",
          "optical_activity": "NONE",
          "stereo_centers": 0
        },
        {
          "uuid": "a51f683f-4ef4-4263-b0dc-30553642875a",
          "id": "a51f683f-4ef4-4263-b0dc-30553642875a",
          "molfile": "\n  Marvin  01132108352D          \n\n 30 32  0  0  0  0            999 V2000\n   -0.6219   -7.1007    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.0969   -6.6892    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.1010   -5.8645    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.8159   -5.4564    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    1.5271   -5.8745    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    2.2424   -5.4657    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n    2.9548   -5.8803    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n    3.6710   -5.4725    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    4.3923   -5.8743    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    4.3884   -6.6978    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    5.1021   -5.4461    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.0858   -4.6237    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    4.3681   -4.2269    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    4.3549   -3.4023    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n    5.0639   -2.9778    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n    5.0507   -2.1521    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    4.3266   -1.7549    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    4.3106   -0.9249    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.0216   -0.4977    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.7425   -0.9004    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.7556   -1.7283    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.0306    0.3212    0.0000 S   0  0  0  0  0  0  0  0  0  0  0  0\n    5.8540    0.3076    0.0000 O   0  5  0  0  0  0  0  0  0  0  0  0\n    5.0332    1.1418    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    4.2040    0.3380    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    3.6582   -4.6488    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    2.9375   -4.2436    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    1.5255   -6.6937    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    2.2394   -7.1036    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.8136   -7.1042    0.0000 C   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 30  2  0  0  0  0\n  4  3  2  0  0  0  0\n  5  4  1  0  0  0  0\n  6  5  1  0  0  0  0\n 28  5  2  0  0  0  0\n  7  6  1  0  0  0  0\n  8  7  2  3  0  0  0\n  8  9  1  0  0  0  0\n 26  8  1  0  0  0  0\n  9 10  2  0  0  0  0\n  9 11  1  0  0  0  0\n 11 12  2  0  0  0  0\n 12 13  1  0  0  0  0\n 14 13  2  3  0  0  0\n 13 26  1  0  0  0  0\n 15 14  1  0  0  0  0\n 16 15  1  0  0  0  0\n 17 16  1  0  0  0  0\n 16 21  2  0  0  0  0\n 18 17  2  0  0  0  0\n 19 18  1  0  0  0  0\n 20 19  2  0  0  0  0\n 19 22  1  0  0  0  0\n 21 20  1  0  0  0  0\n 22 23  1  0  0  0  0\n 22 24  2  0  0  0  0\n 22 25  2  0  0  0  0\n 26 27  2  0  0  0  0\n 28 29  1  0  0  0  0\n 30 28  1  0  0  0  0\nM  CHG  1  23  -1\nM  END",
          "smiles": "Cc1ccc(c(C)c1)NN=c2c(=O)ccc(=NNc3ccc(cc3)S(=O)(=O)[O-])c2=O",
          "formula": "C20H17N4O5S",
          "atropisomerism": "No",
          "charge": -1,
          "count": 1,
          "stereochemistry": "ACHIRAL",
          "count_amount": {
            "type": "MOL RATIO",
            "average": 1,
            "units": "MOL RATIO",
            "uuid": "8062c13a-ad31-4026-a940-c5973159a195"
          },
          "defined_stereo": 0,
          "ez_centers": 0,
          "molecular_weight": "425.4396",
          "optical_activity": "NONE",
          "stereo_centers": 0
        }
      ],
      "definition_level": "COMPLETE",
      "uuid": "4054d045-8ca7-4397-a487-50010d708cbd",
      "version": "4",
      "structure": {
        "id": "9368ce03-62cb-4067-8501-005fc876c425",
        "molfile": "\n  Marvin  01132107392D          \n\n 31 32  0  0  0  0            999 V2000\n    7.9366   -2.9714    0.0000 Na  0  3  0  0  0  0  0  0  0  0  0  0\n    5.7556   -1.7283    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.7425   -0.9004    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.0216   -0.4977    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    4.3106   -0.9249    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    4.3266   -1.7549    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.0507   -2.1521    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.0306    0.3212    0.0000 S   0  0  0  0  0  0  0  0  0  0  0  0\n    5.8540    0.3076    0.0000 O   0  5  0  0  0  0  0  0  0  0  0  0\n    5.0332    1.1418    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    4.2040    0.3380    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    5.0639   -2.9778    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n    4.3549   -3.4023    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n    4.3681   -4.2269    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    3.6582   -4.6488    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    3.6710   -5.4725    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    4.3923   -5.8743    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.1021   -5.4461    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    5.0858   -4.6237    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    2.9375   -4.2436    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    2.9548   -5.8803    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n    2.2424   -5.4657    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0\n    1.5271   -5.8745    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.8159   -5.4564    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.1010   -5.8645    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.0969   -6.6892    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    0.8136   -7.1042    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    1.5255   -6.6937    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n    4.3884   -6.6978    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0\n    2.2394   -7.1036    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n   -0.6219   -7.1007    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0\n 19 14  1  0  0  0  0\n  2  3  2  0  0  0  0\n 15 20  1  0  0  0  0\n  8  9  1  0  0  0  0\n 16 21  1  0  0  0  0\n  8 10  2  0  0  0  0\n 21 22  2  0  0  0  0\n  8 11  2  0  0  0  0\n 22 23  1  0  0  0  0\n  5  6  1  0  0  0  0\n 23 24  2  0  0  0  0\n  7 12  1  0  0  0  0\n 24 25  1  0  0  0  0\n 25 26  2  0  0  0  0\n 12 13  2  0  0  0  0\n 26 27  1  0  0  0  0\n  6  7  2  0  0  0  0\n 27 28  2  0  0  0  0\n 28 23  1  0  0  0  0\n 13 14  1  0  0  0  0\n  7  2  1  0  0  0  0\n 14 15  2  0  0  0  0\n 17 29  1  0  0  0  0\n  3  4  1  0  0  0  0\n 15 16  1  0  0  0  0\n  4  8  1  0  0  0  0\n 16 17  2  0  0  0  0\n 17 18  1  0  0  0  0\n  4  5  2  0  0  0  0\n 18 19  2  0  0  0  0\n 28 30  1  0  0  0  0\n 26 31  1  0  0  0  0\nM  CHG  2   1   1   9  -1\nM  END",
        "smiles": "Cc1ccc(c(C)c1)/N=N/c2c(ccc(c2O)/N=N/c3ccc(cc3)S(=O)(=O)[O-])O.[Na+]",
        "formula": "C20H17N4O5S.Na",
        "atropisomerism": "No",
        "charge": 0,
        "count": 1,
        "stereochemistry": "ACHIRAL",
        "defined_stereo": 0,
        "ez_centers": 2,
        "molecular_weight": "448.4294",
        "optical_activity": "NONE",
        "references": [
          "c28c3e91-f569-4d8d-8821-a1475b6fb1bd",
          "076ccbc1-9a9e-45b5-b4c2-bd62dbae28a4"
        ],
        "stereo_centers": 0
      },
      "unii": "K870FJ9VYZ"
    }
  ]
}