fig8

Figure 8. (A) Schematic of Enol-Keto tautomerism; (B) The synthesis of OC1. Reproduced^[69], Open access, Copyright 2022, RSC; (C) The synthesis of OC2. Reproduced^[69], Open access, Copyright 2022, RSC; (D) Synthesis and enol-keto tautomerism of OCs-1 and OCs-2. Reproduced with permission^[70], Copyright 2024, Elsevier B.V.