CSCC[C@H](NC(=O)OC(C)(C)C)C(=O)N1CCC(C(=O)N[C@@H](Cc2c[nH]c3ccccc23)C(=O)O)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?