Nc1ccc(Oc2ccc(C34CC5C6CC7(c8ccc(Oc9ccc(N)cc9)cc8)CC5C(C3)C(C7)C6C4)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?