Abstract
Two novel diterpenes, norcaesalpinin I (1) featuring an unusual ring C-contracted dinorcassane and caesalpinin U (2) possessing a highly oxygenated furanocassane skeleton were isolated from the seeds of Caesalpinia minax. Their structures were determined by different spectroscopic methods. A plausible biosynthetic pathway of 1 was proposed. The cytotoxic activity of compounds 1 and 2 against HepG2 and HeLa human tumor cell lines was evaluated.
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