CN[C@@H](C)C(=O)N[C@@H](C(=O)N1CCC[C@H]1C(=O)NCc1ccccn1)C(C)C.O=CO
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?