You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (12R)-12-ethyl-12-methyl-4-(4-methylphenyl)-5-(2-methylprop-2-enylsulfanyl)-11-oxa-8-thia-4,6-diazatricyclo[7.4.0.02,7]trideca-1(9),2(7),5-trien-3-one by IUPAC nomenclature, provide its molecular formula.
user
C23H26N2O2S2
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