CCOC(=O)c1sc(NC(=O)CSc2nc3c(c(-c4ccc(OC)cc4)c2C#N)CCCC3)c(C#N)c1C
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?