6 8 - 4 7 1 4 July 8, 2019 16 32 64 128 6 8 4 7 1 4 4 7 6 7 of 8 9 1 4 4 6 8 trimetil 1 4 7 nonatrieno 4/7÷6/7 of 8/9+1)4 4 7 6 7 का 8 9 1 4