The Paal-Knorr series of ring synthesis can be used to provide access to substituted furans, pyrroles, and thiophenes (Figure and Figure ). Its versatility and structural similarity between components, makes it an interesting case for testing retrosynthetic disconnections. The heteroaromatic ring varies by a single nitrogen, oxygen, or sulfur atom, and the ground truth disconnection in each case is almost the same. Figure shows that the disconnections predicted by the model are dependent on the dataset.