1,1-diiodo-4,4-dimethoxy-2-methylbut-1-ene 1-butene, 1,1-diiodo-4,4-dimethoxy-2-methyl- InChI=1/C7H12I2O2/c1-5(7(8)9)4-6(10-2)11-3/h6H,4H2,1-3H