Abstract
The dichloromethane extract of I. tsangii has yielded ten novel sesquiterpenes ( 1–4, 6–11) possessing or derived from the very rare allohimachalane skeleton, in addition to one new himachalane ( 12) and a new megastigmane ( 14). It is suggested that the novel skeletons possesed by seco-allohimachalanes 8–11 are the result of carbon-carbon bond cleavage reactions associated with hydroperoxide autoxidation products (e.g. 6, 7) of the tri-substituted double bond.
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