CN1C(=O)[C@H]2[C@H]3C[C@@H]([C@H]2C1=O)[C@@H]1C(c2ccccc2OCC#N)=NO[C@H]31
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?