6H-benzofuro[3,2-c]furo[3,2-g][1]benzopyran-10-ol, 1,2,6a,11a-tetrahydro-9-methoxy-2-(1-methylethenyl)-, (6aR,11aR)- InChI=1/C21H20O5/c1-10(2)16-7-11-6-13-18(8-17(11)25-16)24-9-14-12-4-5-15(23-3)19(22)21(12)26-20(13)14/h4-6,8,14,16,20,22H,1,7,9H2,2-3H3/t14-,16?,20-/m0/s Pervilline rel-(6aR,11aR)-2-isopropenyl-9-methoxy-1,2,6a,11a-tetrahydro-6H-[1]benzofuro[3,2-c]furo[3,2-g]chromen-10-ol