COc1ccc(-c2cc(=O)oc3c(C)c(OCC(=O)N[C@@H](Cc4ccc(O)cc4)C(=O)O)ccc23)cc1
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?