You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-N-cyclopentyl-2-N,2-N-dimethyl-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidine-2,4-diamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H23N5
assistant