You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-ethyl-3-[4-(2-methylimidazol-1-yl)butyl]-2-(2-methyl-2-morpholin-4-ylpropyl)guanidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H36N6O
assistant