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 N-(2,6-dimethylphenyl)-2-[[2-[(4S)-4-methyl-4,5,6,7-tetrahydrothieno[3,2-c]pyridin-5-ium-5-yl]acetyl]amino]acetamide .
user
C20H26N3O2S+
assistant