You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 4-(3-chlorophenyl)-1-[(5-cyclopropyl-4-methyl-1,2,4-triazol-3-yl)methyl]-3,6-dihydro-2H-pyridine into molecular formula.
user
C18H21ClN4
assistant