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 4-[[2-[(2R)-2-(1,3-benzothiazol-2-yl)pyrrolidin-1-ium-1-yl]acetyl]amino]-N-methylbenzamide ?
user
C21H23N4O2S+
assistant