"506U78" meaning in English

{
  "etymology_text": "From the Burroughs Wellcome internal catalog number \"506U\", which was extended to the unified catalog number \"506U78\" due the 1995 merger to form Glaxo Wellcome a few months after the drug's discovery.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "506U78 (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Pharmaceutical drugs",
          "orig": "en:Pharmaceutical drugs",
          "parents": [
            "Drugs",
            "Matter",
            "Pharmacology",
            "Chemistry",
            "Nature",
            "Biochemistry",
            "Medicine",
            "Sciences",
            "All topics",
            "Biology",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Former designation of Nelarabine; a chemotherapy prodrug used in treatment of T-cell acute lymphoblastic leukemia."
      ],
      "id": "en-506U78-en-noun-x6ovytS3",
      "links": [
        [
          "Nelarabine",
          "nelarabine"
        ],
        [
          "prodrug",
          "prodrug"
        ]
      ],
      "synonyms": [
        {
          "word": "GW506U78"
        }
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "506U78"
}

{
  "etymology_text": "From the Burroughs Wellcome internal catalog number \"506U\", which was extended to the unified catalog number \"506U78\" due the 1995 merger to form Glaxo Wellcome a few months after the drug's discovery.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "506U78 (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English nouns",
        "English terms spelled with numbers",
        "English uncountable nouns",
        "Pages with 1 entry",
        "en:Pharmaceutical drugs"
      ],
      "glosses": [
        "Former designation of Nelarabine; a chemotherapy prodrug used in treatment of T-cell acute lymphoblastic leukemia."
      ],
      "links": [
        [
          "Nelarabine",
          "nelarabine"
        ],
        [
          "prodrug",
          "prodrug"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "GW506U78"
    }
  ],
  "word": "506U78"
}