CCOC(=O)c1sc2c(c1OC(=O)c1ccccc1)c(=O)n(-c1ccccc1)c(=S)n2-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?