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Aqueous and non-aqueous soluble salts of manganese(IV)-containing Keggin polyoxotungstates [(XO 4 )W 11 Mn IV O 36 H x ] n[minus] (X = Si, B, and Zn) have been prepared by chemical and electrolytic oxidation of corresponding manganese(II) or manganese(III) anions, and have been characterized by magnetic...
Two pyridopyrrolopyrimidine alkaloids, variolin A (2) and N(3')-methyl tetrahydrovariolin B (3), have been isolated from the Antarctic sponge Kirkpatrickia varialosa, and their structures determined by X-ray crystallography and interpretation of spectral data respectively. N(3')-Methyl tetrahydrovariolin B (3) is moderately cytotoxic and showed antifungal activity, while variolin A (2) is weakly cytotoxic.
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