C[C@@H]1CN([C@H](C)CO)C(=O)CCCn2cc(nn2)CO[C@H]1CN(C)C(=O)Oc1cccc2ccccc12
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?