You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(3aR,4R,6R,6aR)-4-(5-benzylsulfanyl-3-methylimidazo[4,5-d][1,2]thiazol-6-yl)-2,2-dimethyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-6-yl]methanol by IUPAC nomenclature, provide its molecular formula.
user
C20H23N3O4S2
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