O=C1c2ccccc2C(=O)N1c1nc(-c2ccc(Cl)cc2)cc(N2N=C(c3ccc(Br)cc3)CC2c2ccccc2)n1
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?