O=C(Cn1c(=O)n(-c2ccccc2)c(=O)c2ccc(C(=O)NCc3ccc4c(c3)OCO4)cc21)Nc1ccc(Br)cc1
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?