COc1cc(-c2cc(NC(C)=O)c3ncc(-c4cc(OC)c(OC)c(OC)c4)n3c2)cc(OC)c1OC
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?