4 4 diethyl 2 3 dimethylheptane July 8, 2019 16 32 64 128 4 5 diethyl 2 3 dimethylheptane 2 2-dimethyl-3 4 dimethylheptane 4 4-dimethyl-3-ethylheptane 2 3-dimethyl-4-ethylheptane 4 4 dimethylheptan 2 4-dimethylheptane
