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 1-ethyl-2-[2-(4-methylpiperazin-1-yl)propyl]-3-(4-methyl-1-propan-2-ylpyrrolidin-3-yl)guanidine ?
user
C19H40N6
assistant