CC(=O)Nc1ccc(NCC(=O)Nn2cnc3ccc(S(=O)(=O)Nc4ccc(NC(C)=O)cc4)cc3c2=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?