CCO[C@@H]1OC(C(=O)N2CCN(Cc3ccccc3)CC2)=C[C@H](c2cn(C(C)=O)c3ccccc23)[C@H]1CCCO
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?