You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 3-ethyl-1-methyl-2-[2-methyl-2-(1-phenylethylamino)propyl]-1-[(2-methyl-1,2,4-triazol-3-yl)methyl]guanidine ?
user
C20H33N7
assistant