You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(6R)-3-cyano-6-methyl-4,5,6,7-tetrahydro-1-benzothiophen-2-yl]-2-[(4-oxo-3-phenyl-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-2-yl)sulfanyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H26N4O2S3
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