CC1(C)CC(=O)C2=C(C1)N1C(=C(C#N)C2c2cccc(Cl)c2)N=C(N)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?