Caesalminaxins O-T, cassane diterpenoids from the seeds of Caesalpinia minax and their anti-inflammation

Six previously undescribed cassane diterpenoids, named caesalminaxins O-T (1–6), together with 28 known compounds (7–34), were isolated from the seeds of Caesalpinia minax Hance. Their structures, including their absolute configurations were elucidated by extensive spectroscopic analysis, X-ray diffraction, and quantum chemical calculations. Among the undescribed diterpenoids, compound 6 that possessed an unusual enol group at C-7 with a highly...