You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-[(1S,2R,9R,10R,11S,12S,16R)-9-(4-hydroxy-3,5-dimethoxyphenyl)-6,13,15-trioxo-3,7-dithia-5,14-diazapentacyclo[9.5.1.02,10.04,8.012,16]heptadec-4(8)-en-14-yl]butanoic acid by IUPAC nomenclature, provide its molecular formula.
user
C25H26N2O8S2
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