You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S)-1-(4-ethylanilino)-1-oxopropan-2-yl] 2-(pyrrolidine-1-carbothioylsulfanyl)acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H24N2O3S2
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