O=C1C=CC(S(=O)(=O)C2=C/C(=C/Nc3ccc(Cl)cc3)C(=O)C=C2)=C/C1=C/Nc1ccc(Cl)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?