CCN[C@@H]1C[C@H](N)[C@H](O[C@H]2OC(CN)=CC[C@H]2N)[C@@H](O)[C@H]1O[C@H]1OC[C@@](C)(O)[C@@H](NC)[C@@H]1O
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?