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The isolation of four new kaurenolides from the culture filtrates of Gibberella fujikuroi strain TP70 is described. Structures (4), (6), (9), and (10), deduced for these metabolites from chemical and spectroscopic data, represent three new positions (at C-1, -3, and -11) of hydroxylation of ent-kaur-16-ene by this fungus. In addition 7β,11α-dihydroxy-18-norkaurenolide (11) has been isolated.
P. Hedden, J. MacMillan and M. J. Grinsted, J. Chem. Soc., Perkin Trans. 1, 1973, 2773 DOI: 10.1039/P19730002773
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