1 GBJ 4-[(3r)-8,8-dimethyl-3,4-dihydro-2h,8h-pyrano[2,3-f]chromen-3-yl]benzene-1,3-diol 1.000 2 J6L 8,8-dimethyl-3-(2,4,5-trimethoxyphenyl)pyrano[2,3-f]chromen-4-one 0.710