Prenyl side chains (hemiterpene
moieties) containing conjugated double bonds are generally prone to oxidation.
and two unusual hemiterpene
esters) the means of northern, central and southern west Coast populations were similar.
In addition, several types of terpenoids or terpenes ([C.sub.10][H.sub.16]), such as diterpenes ([C.sub.20]), triterpenes ([C.sub.30]), tetraterpenes ([C.sub.40]), hemiterpenes
([C.sub.5]), and sesquiterpenes ([C.sub.15]), have also effective antifungal activity .
Many of them are volatile, as hemiterpenes
([C.sub.5]), monoterpenes ([C.sub.10]), sesquiterpenes ([C.sub.15]), and even some diterpenes ([C.sub.20]).
They are classified as hemiterpenes
(C5), monoterpenes (C10), sesquiterpenes (C15), diterpenes (C20), sesterpenes (C25), triterpenes (C30), tetraterpenes (C40), and polyterpenes (>C40).