O=C1CSC(c2ccc([N+](=O)[O-])cc2)N1c1ccc(-c2ccc(-n3c(-c4ccccc4)nc4ccccc4c3=O)cc2)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?