You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance [(2S)-1-[(3-cyanothiophen-2-yl)amino]-1-oxopropan-2-yl] (2S)-2-(furan-2-carbonylamino)-3-methylbutanoate .
user
C18H19N3O5S
assistant