CC1=C(CO)C(=O)OC(C(C)C2CCC3C4CC5OC56C(O)C(N5CC5)=CC(=O)C6(C)C4CCC23C)C1
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?