You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4Z)-4-[(2E)-2-(1-ethylquinolin-2-ylidene)ethylidene]-3-phenyl-1,2-oxazol-5-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H18N2O2
assistant