You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule tert-butyl (3R)-4-[[(2S)-1-aminopropan-2-yl]-methylamino]-3-[[3-(difluoromethyl)phenyl]methyl]-4-oxobutanoate ?
user
C20H30F2N2O3
assistant