CCCSc1nc(-c2ccc(OC)cc2)c(C#N)c(=O)n1C1OC(COC(C)=O)C(OC(C)=O)C(OC(C)=O)C1OC(C)=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?