5 ethyl 2 4 6 trimethylheptane July 8, 2019 16 32 64 128 2 4 dichloro 3 ethyl 4 5 6 trimethylheptane 2 2 5-trimethylheptane 5-ethyl-2 2 4-trimethylheptane 2 4 5-trimethylheptane 2 5 5-trimethyl-6-heptyne