You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1R,9S,13S)-N-(4-methoxyphenyl)-9-methyl-10-(2-methylphenyl)-11-sulfanylidene-8-oxa-10,12-diazatricyclo[7.3.1.02,7]trideca-2,4,6-triene-13-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C26H25N3O3S
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