C[C@]12c3[nH]c4cc(-c5ccco5)ccc4c3CCN1C(=O)[C@@H](CC(=O)NCCCn1ccnc1)C[C@@H]2C(=O)N1CCCCC1
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?