CO[C@@H]1C[C@H]2[C@@H]3CC[C@H]([C@H](C)COC(C)=O)[C@@]3(C)CC[C@@H]2[C@@]2(C)CC[C@H]3C[C@]312
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?