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-methyl-4-[[3-methyl-2-[N'-(2-methylpropanoyl)carbamimidoyl]-1-benzothiophen-6-yl]oxy]pyridine-2-carboxamide .
user
C21H22N4O3S
assistant