COc1ccc([C@@H]2[C@H]3CN(C(C)=O)CC=C3C(C#N)=C(N)C2(C#N)C#N)c2ccccc12
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?