Zizaanes and Prezizaanes

Bonds between C-2 and C-11, C-6 and C-10 as well as C-6 and C-15 of famesane formally link up the tricyclic sesquiterpene skeleton prezizaane, which converts into zizaane by methyl shift. 

The oil of vetiver with its aromatic to harsh, woody odor, steam-distilled for perfumery from roots of vetiver grass Vetiveria zizanoides (Poaceae) which is grown chiefly in Haiti, India, and Java, contains some prezizaanes and zizaanes such as (+)-prezizaene, (-)-7-prezizaanol, (-l-)-6(13)-zizaene and (-l-)-6(13)-zizaen-12-ol, also known as khusimol. 

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