You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2Z)-8-[(3,4-dichlorophenyl)methyl]-2-[(E)-3-phenylprop-2-enylidene]-7,9-dihydrofuro[2,3-f][1,3]benzoxazin-3-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H19Cl2NO3
assistant