C=C1C2CC[C@@]3(C)C(c4ccoc4)OC(=O)C[C@@]13OC1CC(=O)C(C)(C)C(CC(=O)OC)[C@]12C
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?