O=C(Cc1ccccc1)Oc1ccc2c(-c3ccccc3)c(C(=O)Nc3ccc(Cl)cc3)c(=O)oc2c1
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?