You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[4-(2,4-dichlorophenyl)oxan-4-yl]methyl]-3-[2-(3-ethyl-1,2,4-triazol-4-yl)ethyl]-2-methylguanidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H28Cl2N6O
assistant