CC(=O)OC(C)C1C2=C(C(=O)CC1(C)O)C(=O)c1c(ccc(-c3ccc4c(c3O)C(=O)C3=C(C4=O)C(C(C)OC(C)=O)C(C)(O)CC3=O)c1O)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?