Cl.O=[N+]([O-])c1ccccc1S(=O)(=O)NC[C@H]1CC[C@H](CNCC2CCc3ccccc3C2)CC1
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?