O=C(c1ccccc1)N(C(=O)c1ccccc1)c1ncnc2c1C(c1ccccc1)c1c(ccc3ccccc13)O2
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?