O=C1C=CC(S(=O)(=O)C2=C/C(=C/Nc3ccc(Cl)cc3)C(=O)C=C2)=C/C1=C/Nc1ccc(Cl)cc1
The donor in a hydrogen bond is usually a strongly electronegative atom such as N, O, or F that is covalently bonded to a hydrogen bond. How many hydrogen bond donors does the molecule have?