O=[N+]([O-])c1ccc2c(c1)N=C1O[C@H](c3ccc([C@H]4OC5=Nc6cc([N+](=O)[O-])ccc6NC5=C4O)cc3)C(O)=C1N2
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?