You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[4-[4-[3-[2-(4-chlorophenyl)pyrazol-3-yl]phenyl]piperazin-1-yl]phenyl]-4-[[(2R)-4-(dimethylamino)-1-phenylsulfanylbutan-2-yl]amino]-3-nitrobenzenesulfonamide by IUPAC nomenclature, provide its molecular formula.
user
C43H45ClN8O4S2
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