You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-butyl-N-[2-[4-(2-methylphenyl)-6,7-dihydro-4H-thieno[3,2-c]pyridin-5-yl]-2-oxoethyl]-4-phenylbenzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H34N2O2S
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