You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 1-N-[1-(2,5-dimethylthiophen-3-yl)ethyl]-4-N,4-N-diethylpiperidine-1,4-dicarboxamide ?
user
C19H31N3O2S
assistant