CN(C)[C@@H](COC(C)(C)C)c1nnc([C@H](Cc2ccc(OC(C)(C)C)cc2)NC(=O)C2CCN(C(=O)OC(C)(C)C)CC2)o1
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?