O=c1c2cc3c(=O)n4c(cc(-c5ccccc5)c5cc(Cl)ccc54)nc3cc2nc2cc(-c3ccccc3)c3cc(Cl)ccc3n12
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?