More encouragingly, the dUCT enhancement solved more instances in the heavy molecule dataset than the unmodified UCT (Table ). 164 molecules were solved, 15% more than the 142 achieved by UCT and eUCT. dUCT found nearly 300 more routes to target molecules than UCT, a 35% increase. Furthermore, the increase in solving routes is not solely from the increase in the number of solved molecules. dUCT found the highest number of routes per solved molecule: 6. Our primary tests ( Table . Primary testing of enhancements, using AiZynthFinder 4.3 with the 50K ChEMBL dataset. eUCT and two variants of dUCT: v1 and v2, were run against the unmodified UCT for different values of the maximum number of iterations.