O=C1c2cccnc2C(=O)c2c1nc1ccccc1c2-c1cncc(-c2c3c(nc4ccccc24)C(=O)c2cccnc2C3=O)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?