O=c1cc(-c2ccc(Cl)cc2)oc2cc(OCCCOc3ccc4c(=O)cc(-c5ccc(Cl)cc5)oc4c3)ccc12
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?