ustilaginoidin B
ustilaginoidin b
A binaphthopyran resulting from the formal oxidative coupling at positions 9 of molecules of 5,6,8-trihydroxy-2-methyl-4<em>H</em>-benzo[<em>g</em>]chromen-4-one and 5,6,8-trihydroxy-2-(hydroxymethyl)-4<em>H</em>-benzo[<em>g</em>]chromen-4-one.