NC(=O)c1ncn([C@@H]2O[C@H](CNC3=NS(=O)(=O)c4ccccc43)[C@@H](O)[C@H]2O)n1
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?