O=C(C1=C(O)C(=O)N(C2CCS(=O)(=O)C2)C1c1cccc(O)c1)c1ccc(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?