M.S.R. Nair

Metabolites of pyrenomycetes XIII: Structure of (+) hypothemycin, an antibiotic macrolide from Hypomyces trichothecoides☆

Abstract (+) Hypothemycin, an antibiotic metabolite of Hypomyces trichothecoides, has been assigned the macrolide structure I, based on chemical evidence and spectroscopic data.

Frustulosinol, an antibiotic metabolite of Stereum frustulosum: Revised structure of frustulosin

Abstract On the basis of chemical reactions and spectroscopic data, frustulosinol, a new antibiotic metabolite of Stereum frustulosum , has been assigned an acetylenic structure. This has led to a revised structure for the related metabolite, frustulosin.

Biogenesis and revised structure of rosellisin; structure of rosellisin aldehyde

Abstract On the basis of new data from biogenetic studies on rosellisin, the positions of the 3-OMe and the 4-CH 2 OH have been interchanged, resulting in a revised structure. A new metabolite has been identified as rosellisin aldehyde.

Isolation of dihydroilludin M from Clitocybe illudens

Abstract Dihydroilludin M (Ia) has been isolated from culture liquids of Clitocybe illudens . This metabolite differs from the dihydroilludin M obtained by borohydride reduction of illudin M, only in the configuration at C-7, one of three asymmetric centers in the molecule.

Metabolites of pyrenomycetes XI. Structure of Aurocitrin, a new antibacterial pigment from Hypocrea citrina.☆

Abstract Isolation and structure elucidation of aurocitrin, a new antibiotic metabolite from two varieties of the hypocrealean fungus, H. citrina , is reported.

The structure of illudol

Abstract Detailed evidence is given for the structure and partial stereochemistry of illudol, a sesquiterpenoid triol obtained from the Basidiomycete Clitocybe illudens .

Cassiaxanthone, a hydroxyxanthone dicarboxylic acid from Cassia species

Abstract A pale yellow crystalline material isolated from a bicarbonate extract of leaves of Cassia reticulata has been identified as 1-hydroxyxanthone-6,8-dicarboxylic acid. The possibility that this compound is a natural product rather than an artefact, as suggested earlier, is discussed.