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 1,2-dimethyl-1-[(1-methylpyrrol-2-yl)methyl]-3-[[4-(oxolan-2-ylmethylsulfamoyl)phenyl]methyl]guanidine .
user
C21H31N5O3S
assistant