Eremophila viscida

Spiro diterpenes E. viscida, as the name implies, is a species whose branches and leaves carry a sticky resin and this appearance gave rise to the vernacular name of varnish bush. The resin consists largely of material extractable into base. The major components are two diterpene acids (131,132) which disclosed a new diterpene skeleton (111). Although a small amount of the crystalline dihydroxy acid (131) could be obtained after tedious separation, as often found with Eremophila resins, the process was simplified by methylation of the crude acidic fraction and separation of the methyl esters. 

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