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Synthesis of oleanolic acid oxime ester derivatives (3a–3t). Reagents and conditions: (a) Jones reagent, acetone, 0 °C; (b) NH2OH·HCl (1.0 eq.), EtOH, NaOAc (2.0 eq.), rt, 1 h; (c) cinnamoyl chlorides and benzoyl chlorides (2.0 eq.), pyridine, DCM, 0 °C ∼ rt, overnight.
