(1-beta,11-beta,12-alpha)-11,20:13,21-Diepoxy-1,11,12-trihydroxypicras-3-ene-2,16-dione 138752-51-9 Picras-3-ene-2,16-dione, 11,20:13,21-diepoxy-1,11,12-trihydroxy-, (1-beta,11-beta,12-alpha)-