Figure visualizes some challenging retrosynthesis cases achieved by HGAR and two competitive semi-template baselines (i.e., GraphRetro and MEGAN), which further demonstrates the feasibility of HGAR. In Figure (a), the reaction center is predicted correctly by all the methods but both GraphRetro and MEGAN make mistakes when adding motifs, while HGAR succeed in predicting them. In Figure (b) and 2(c), HGAR predicts the reaction center and adds motifs correctly, while the baselines make mistakes in both steps due to their reaction center prediction Not as capable as HGAR. In Figure 2(d), although the reaction center is identified correctly by all the methods, both GraphRetro and MEGAN fail to predict the motif to be added. These examples show that when dealing with molecules with complex structures, our method is superior to the baselines.