CCOC(=O)C1=C(C)N2C(=C(C#N)[C@@H]1c1ccc(C(=O)OC)cc1)SC[C@@]2(O)C(C)(C)C
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?