You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(Z)-1-(3,5-dichloro-2-hydroxyphenyl)ethylideneamino]-1-hydroxynaphthalene-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H14Cl2N2O3
assistant