COc1ccc(C(=O)Sc2c(-c3ccccc3)c(=O)n(-c3ccccc3)c(=S)n2-c2ccccc2)cc1
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?