You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-benzylpiperazin-1-yl)-[4-[(2-chlorophenyl)methyl]-2-methylthieno[3,2-b]pyrrol-5-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H26ClN3OS
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