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 5-tert-butyl-N-(1-cyanopropan-2-yl)-N-methyl-4,5,6,7-tetrahydro-1-benzothiophene-2-carboxamide ?
user
C18H26N2OS
assistant