CSc1nc(N)c2ncn([C@H]3O[C@H](COP(=O)(O)OP(=O)(O)O)[C@@H](O)[C@@H]3O)c2n1
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?