CC(=O)Oc1ccc(-c2c(OC(C)=O)c(OC(C)=O)c(-c3ccc(OC(C)=O)c(OC(C)=O)c3)c(OC(C)=O)c2OC(C)=O)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?