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Allopurinol Imp. E (EP); Allopurinol USP Related Compound E; Allopurinol USP RC E; Ethyl 5-(Formylamino)-1H-pyrazole-4-carboxylate; Allopurinol Related Compound E; Allopurinol Impurity E CAS 31055-19-3 PubChem CID 13926581
CCOC(=O)c1cn[nH]c1NC=O