Structure of Helicobasidin, a Novel Benzoquinone from Helicobasidium mompa TANAKA.

Abstract
The structure of helicobasidin, a major pigment of Helicobasidium mompa TANAKA, was proved to be (S)-3-methyl-2, 5-dihydroxy-6-(1, 2, 2-trimethylcyclopentyl) benzoquinone (IV).