C#C[C@]1(O)CC[C@H]2[C@H]3CCC4=Cc5oncc5C[C@]4(C)[C@@H]3CC[C@]21C
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?