CC(=O)Oc1ccc(C(=O)[C@H]2[C@H]3C(=O)N(c4cccc5ccccc45)C(=O)[C@H]3[C@@H]3C=CC=NN32)cc1
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?