C[C@@H](CN)CC(=O)O.C[C@@H](CN)CC(=O)O.O=S(=O)(O)c1cccc2c(S(=O)(=O)O)cccc12
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?