COc1cc2c(c(OC)c1OC)-c1ccc(SC)c(=O)cc1C(CC(=O)Oc1cccc(C#N)c1)C2
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?