You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[(4-cyclopropyl-5-pyridin-4-yl-1,2,4-triazol-3-yl)sulfanyl]-5,6,7,8-tetrahydroquinazoline is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H18N6S
assistant