O=C(O)c1ccc(S(=O)(=O)c2ccc3c(c2)C(=O)N(NC(=O)c2cccnc2)C3=O)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?