O=C(O)[C@@H]1CCCN1S(=O)(=O)c1cccc(S(=O)(=O)N2CCC[C@H]2C(=O)O)c1
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?