Tetramethylsqualene, a triterpene from Botryococcus braunii var. Showa
1989
Abstract A new triterpene, tetramethylsqualene, produced by Botryococcus braunii var. showa , was isolated and characterized by NMR and mass spectroscopy. The compound is a squalene derivative with non-isoprenoid methyls at C-3, C-7, C-18, and C-22. Tetramethylsqualene was a minor component ( ca 0.2 %) of normal cultures; however, its concentration increased 20-fold in cultures supplemented with 2.1 mM l -methionine.
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