You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-[4-[2-(4-benzylpiperazin-1-yl)-2-oxoethoxy]-3-methoxyphenyl]-6-(4-chlorophenyl)thieno[3,2-d]pyrimidin-4-one by IUPAC nomenclature, provide its molecular formula.
user
C32H29ClN4O4S
assistant