O=C(c1c(F)c(F)c(F)c(F)c1F)n1c(=S)n(C(=O)c2c(F)c(F)c(F)c(F)c2F)c2ccccc21
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?