You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-cyclopentyl-2-[(4-ethenylphenyl)methylsulfanyl]-3-(2-methylpropyl)-4-oxoquinazoline-7-carboxamide is given. What is its corresponding molecular formula?
user
C27H31N3O2S
assistant