Isopimara-9(11), 15-Diene-3β, 19-diol from Newcastlia viscida (Verbenaceae)

Abstract
The title diterpenoid has been separated after base treatment of acidic and neutral extracts. Its structure is assigned by conversion into isopimara-8,15-diene and by spectroscopic data. The stereochemistry follows from chemical and spectroscopic examination of the 11α,16-diol formed by hydroboration of the ethylidene derivative.

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