You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-cyclopropyl-1-(5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-yl)piperidin-4-amine into molecular formula.
user
C18H24N4S
assistant