COc1ccc(OC)c(N2C(N)=C(C#N)C(c3ccc(OC)c(O)c3)C3=C2CC(C)(C)CC3=O)c1
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?