You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 8-cyclopentyl-2-[4-(4-isocyanophenyl)piperazin-1-yl]-7-oxopyrido[2,3-d]pyrimidine-6-carbonitrile .
user
C24H23N7O
assistant