Incubation of ent-19-hydroxy-13-epi-manoyl oxide with Gibberella fujikuroi afforded ent-12α,19-dihydroxy-13 -epi-manoyl oxide and ent-7β, 12α, 19-trihydroxy-13 -epi-manoyl oxide, the first of which was transformed by chemical methods into varol (ent-12α-hydroxy-13-epi-manoyl oxide). The incubation of ent-3β-hydroxy-13-epi-manoyl oxide (ribenol) with the same fungus gave the 12β-hydroxy, the 11β-hydroxy and the 11β,12β-dihydroxy derivatives of ribenol, the first of which was identical with varodiol. © 1989.
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