2H-1-benzopyran-2-one, 6,7-dimethoxy-5-(3-methyl-2-butenyl)- 6,7-dimethoxy-5-(3-methylbut-2-en-1-yl)-2H-chromen-2-one InChI=1/C16H18O4/c1-10(2)5-6-12-11-7-8-15(17)20-13(11)9-14(18-3)16(12)19-4/h5,7-9H,6H2,1-4H