O=C(NCCN1C(=O)S/C(=C\c2cccs2)C1=O)[C@H](Cc1ccccc1)N1C(=O)c2ccccc2C1=O
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?