COC(=O)CC1C(C)(C)C(=O)C2CC3=C4CC(=O)OC(c5ccoc5)C4(C)CCC3C1(C)C2=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?