You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named ethyl 4-cyano-5-[[2-[(3-cyano-6-methyl-4-thiophen-3-yl-7,8-dihydro-5H-1,6-naphthyridin-2-yl)sulfanyl]acetyl]amino]-3-methylthiophene-2-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C25H23N5O3S3
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