Four new terpenoglycoside antibiotics, phenalinolactones A-D were isolated from Streptomyces sp. Tü 6071. The structures were elucidated on the basis of detailed NMR and MS analyses. Phenalinolactones combine a diterpenoid tricycle, a 2,3,6-trideoxysugar, a pyrrole-carboxylic acid and an uncommonly oxidized unsaturated γ-lactone in a unique manner. Phenalinolactones show an inhibitory activity against gram-positive bacteria.
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