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Ethyl 4-chloroisoxazolo[5,4-d]pyrimidine-3-carboxylate 4-Chloroisoxazolo[5,4-d]pyrimidine-3-carboxylic acid ethyl ester Isoxazolo[5,4-d]pyrimidine-3-carboxylic acid, 4-chloro-, ethyl ester 4-Chloroisoxazolo[5,4-d]pyrimidine-3-carboxylic acid ethyl ester ISO 9001：2015 REACH