You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(7,7-dimethyl-2-oxabicyclo[3.2.0]heptan-6-yl)-2-ethyl-1-methyl-1-[(5-phenyl-1H-imidazol-2-yl)methyl]guanidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H31N5O
assistant