CC(=O)OCC12C(OC(C)=O)C[C@@H](C)C3(CC(c4ccoc4)OC3=O)C1CCC(OC(C)=O)C21CO1
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?