You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-(2-chloro-4-methoxyphenyl)ethyl]-3-[3-(3,5-dimethyl-1,2-oxazol-4-yl)propyl]-2-methylguanidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H27ClN4O2
assistant