Abstract
Five new pimarane and related-type diterpenes (i.e. EBC-316, 325–327, and 345 (10–15)), together with two known pimaranes (EBC-221 (8) and EBC-346 (9)), were isolated from the stems of Croton insularis, found in the Australian rainforest. All pimarane diterpenes disclosed herein are suggested to be biogenetically related to the same keto-Jacobs–Reynolds intermediate 2, via ring A and C oxidation. Anticancer activities of compounds 11–13 are reported.
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