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 N-(1-adamantylcarbamoyl)-2-[(4S)-4-methyl-4,5,6,7-tetrahydrothieno[3,2-c]pyridin-5-ium-5-yl]acetamide .
user
C21H30N3O2S+
assistant