IPP and DMAPP are universal building blocks for the synthesis of various classes of terpenes. The enzyme, isopentenyl pyrophosphate isomerase catalyses reaction between IPP and DMAPP in presence of metal ion to produce geranylpyrophospahte (GPP), farnesyl pyrophosphate (FPP), geranylgeranylpyrophosphate (GGPP), squalene from IPP and DMAPP; a precursor for mono-, sesqui-, di-, tri-, tetra-, and poly-terpenes.The simple schematic representation [9] is shown here.