You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[[(2S)-4-(2-aminopropan-2-yl)pyrrolidin-2-yl]methyl]-2-methyl-3-[[(3R,5S)-5-[(propanoylamino)methyl]pyrrolidin-3-yl]methylamino]propanamide into its molecular formula.
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C21H42N6O2
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