Experiments with intact callus cultures of Andrographis paniculata and a derived cell-free system indicated that (a) the biosynthesised γ-bisabolene has the Z-configuration (3); (b) the biosynthetic intermediate is 2-cis, 6-trans-(1)- and not 2-cis,6-cis-(2)-farnesol pyrophosphate; (c) in paniculide B (5) the ring carbon derived from C-2 of mevalonate is anti to the side chain.
K. H. Overton and D. J. Picken, J. Chem. Soc., Chem. Commun., 1976, 105 DOI: 10.1039/C39760000105
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