COc1ccc2cc(-c3cc(C(=O)OCC(=O)Nc4c(C)n(C)n(-c5ccccc5)c4=O)c4ccccc4n3)ccc2c1
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?