CCOC(=O)c1c(-c2ccc(OC)c(O)c2)c(C#N)c(=S)n(C2OC(CO)C(O)C(O)C2O)c1-c1ccccc1
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?