You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [2-[(1-cyanocyclohexyl)amino]-2-oxoethyl] (5S)-5-ethyl-4,5,6,7-tetrahydro-1-benzothiophene-2-carboxylate .
user
C20H26N2O3S
assistant