6-溴-8-环戊基-5-甲基-2-甲硫基-8H-吡啶并[2,3-d]嘧啶-7-酮

8-cyclopentyl-5-methyl-2-methylsulfanyl-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylic acid ethyl ester