COC(=O)C1=C(C(=O)OC)SC(=C2C(=S)C(C)(C)N(C(=O)C3CC3)c3ccccc32)S1
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?