You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-(6,7-dimethoxy-1-thiophen-2-yl-3,4-dihydro-1H-isoquinoline-2-carbonyl)-1-(4-methoxyphenyl)pyrrolidin-2-one by IUPAC nomenclature, provide its molecular formula.
user
C27H28N2O5S
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