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Abstract
Phytochemical investigation on the seeds of Caesalpinia decapetala led to the isolation of a new cassane diterpenoid with an unusual O bridge between C-19 and C-20, named phanginin Q (1), together with three known cassane diterpenoids, caesaljapin (2), caesaldekarin A (3), and caesaldekarin B (4). The structure of the new compound was elucidated by spectroscopic methods, including 1H NMR, 13C NMR, HSQC, 1H − 1H COSY, HMBC, NOESY, and HR-ESI-MS.
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No potential conflict of interest was reported by the author(s).
Additional information
Funding
This research was financially supported by the National Natural Science Foundation of China [grant number 81403088], Fundamental Research Funds for the Central Public Welfare Research Institutes [grant number ZZ070838], Project Funded by China Postdoctoral Science Foundation [grant number 2013M541160], Fundamental Research Funds for the Self-selected Topic Project of China Academy of Chinese Medical Sciences [grant number ZZ2014042], and Special Fund for TCM supported by State Administration of Traditional Chinese Medicine [grant number 2015468002-4].