You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-chloro-2-[3-(5-chloro-1,3-benzoxazol-2-yl)prop-2-enylidene]-3-ethyl-1,3-benzoxazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H14Cl2N2O2
assistant