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tert-butyl 4-(4-nitrophenyl)piperazine-1-carboxylate
aniline
1-t-Butoxycarbonylpiperazine
1-(4-Nitrophenyl)piperazine
4-Fluoronitrobenzene
4-[4-(8-cyclopentyl-6-ethyl-5-methyl-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidin-2-ylamino)phenyl]-piperazine-1-carboxylic acid tert-butyl ester
2-[4-(4-tert-butoxycarbonylpiperazin-1-yl)phenylamino]-8-cyclopentyl-5-methyl-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylic acid methyl ester
4-[4-(8-cyclopentyl-6-ethynyl-5-methyl-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidin-2-ylamino)phenyl]-piperazine-1-carboxylic acid tert-butyl ester
2-[4-(4-tert-butoxycarbonylpiperazin-1-yl)phenylamino]-8-cyclopentyl-5-methyl-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylic acid
2-[4-(4-tert-butoxycarbonylpiperazin-1-yl)phenylamino]-8-cyclopentyl-5-methyl-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylic acid ethyl ester