2-(2,4-dihydroxyphenyl)-8-[2-(2,4-dihydroxyphenyl)-5,7-dihydroxy-3-(3-methylbut-2-en-1-yl)-4-oxo-4H-chromen-8-yl]-5-hydroxy-9,9,11-trimethyl-3-(3-methylbut-2-en-1-yl)-8a,9,10,12a-tetrahydro-4H,8H-benzo[c]pyrano[2,3-f]chromen-4-one