4 5 6 3 4 7 July 8, 2019 16 32 64 128 4 5 6 3 7 8 5 6 3 4 7 2 X 7 4 6 5 3 4 8 x 4 5 x 6 3 4 x 7 5 6 diethyl 3 4 4 7 tetramethyloctane
