Design new routes based on analogue routes A short-range retrosynthetic search was conducted first for the synthesis of BocPP, the intermediate proposed in the previous section. The search gave 3-step routes starting from a commercial molecule 4-FP, as shown in Fig. . The feedstock 4-FP can also be synthesized from 4-PCA (Reaxys ID: 37513873) which in turn can be prepared from platform molecules derived from cellulose, see Fig. . However, the subroute from BPA to BocPP involved several hazardous molecules as highlighted in red in Fig. , and this was the only route found using "Search synthesis routes".