O=C(C1=C(O)C(=O)N(CCCn2ccnc2)C1c1ccc(Br)cc1)c1ccc2c(c1)OCCO2
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?