O=C1c2c(c(-c3ccccc3)c(-c3ccccc3)c(-c3ccccc3)c2-c2ccccc2)C(=O)N1c1cccc(Br)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?