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7-Boc-2,4-bis(trifluoromethyl)-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidine tert-butyl 2,4-bis(trifluoromethyl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate 2,4-bis-trifluoromethyl-5,8-dihydro-6H-pyrido[3,4-d]pyrimidine-7(8H)-carboxylic acid t-butyl este 2,4-bis-trifluoromethyl-5,8-dihydro-6H-pyrido[3,4-d]pyrimidine-7(8H)-carboxylic acid t-butyl ester Pyrido[3,4-d]pyrimidine-7(6H)-carboxylic acid, 5,8-dihydro-2,4-bis(trifluoromethyl)-, 1,1-dimethylethyl ester