1H-indene-1,3(2H)-dione, 5-methoxy-2,2,4-trimethyl-7-(1-methylethyl)- 7-isopropyl-5-methoxy-2,2,4-trimethyl-1H-indene-1,3(2H)-dione InChI=1/C16H20O3/c1-8(2)10-7-11(19-6)9(3)12-13(10)15(18)16(4,5)14(12)17/h7-8H,1-6H