You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[(2S)-4-methyl-1-[[(1S)-1-phenylethyl]amino]-1-sulfanylidenepentan-2-yl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H30N2O2S
assistant