You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[[(1R,2S)-2-methylcyclohexyl]amino]-2-oxoethyl] (2S)-1-(4-methylphenyl)sulfonylpyrrolidine-2-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H30N2O5S
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