You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(1-ethylpyrrolidin-2-yl)methyl]-2-methyl-3-(4-methyl-2-morpholin-4-ylpentyl)guanidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H39N5O
assistant