Two new resistomycin-type pentacyclic polyketide derivatives, designated 1-hydroxy-1-norresistoflavins B (1) and C (2), together with 1R-hydroxy-1-norresistomycin (3) and (6 R)-6,11-Dihydro-7-hydroxy-6-(hydroxymethyl)-8-methoxy-3,9-dimethyl-4H-pyrazino[1,2-b]i... ...

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