C=C1C(=O)O[C@@H]2[C@H]1C[C@H]1O[C@]1(C)CC/C=C(\C)CCC[C@H](C)[C@H]2OC(C)=O
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?