You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-[5-[2-[(dimethylamino)methyl]-4-methoxyphenyl]thiophen-2-yl]ethyl]-6,7-dimethoxy-2-methylquinazolin-4-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H32N4O3S
assistant