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The skeletal rearrangement conducive to the observed labeling patterns of IPP as reconstructed from the terpenoid compounds studied. 13C labels from [1-13C]deoxyxylulose are shown as solid circles. Labeling from [2,3,4,5-13C4]deoxyxylulose is shown by bold lines. Arrow indicates the carbon atom documented by the NMR patterns in Fig. 4. R = H or PO3H2.
