You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(7,7-dimethyl-2-oxabicyclo[3.2.0]heptan-6-yl)-3-ethyl-2-[(2-phenyl-1,3-oxazol-4-yl)methyl]guanidine;hydroiodide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H29IN4O2
assistant