C=C(C)[C@@H]1CCC2=C[C@@H](OC2=O)[C@@H](C(=C)C)c2cc(C(=O)O)c(o2)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?