CC1(C)[C@H](C(=O)[O-])N2C(=O)[C@@H](NS(=O)(=O)c3ccc([N+](=O)[O-])cc3)[C@H]2S1(=O)=O.[Na+]
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?