O=C(c1ccc(Cl)cc1)[C@@H]1[C@@H]2C(=O)N(c3ccc(Cl)cc3)C(=O)[C@@H]2C2c3ccccc3C=NN21
Hydrogen bond acceptor: The atom, ion, or molecule component of a hydrogen bond which does not supply the bridging (shared) hydrogen atom. How many hydrogen bond acceptors does the molecule have?