6-(3-Methylbut-2-en-1-yl)benzene-1,2,4-triol is an intermediate used in the synthesis of Endophenazine B (E555485), which is a new phenazine antibiotic isolated from the arthropod associated endosymbiont Streptomyces anulatus and shows antimicrobial activities against Gram-positive bacteria and some filamentous fungi, and herbicidal activity against Lemna minor (duckweed).