4 propyl 2 heptyne July 8, 2019 16 32 64 128 4 propyl 2 heptene 5 ethyl 4 propyl 2 heptyne 5 ethyl 4 propyl 2 heptyne structure 5 methyl 4 propyl 2 heptene 2 3 dimethyl 4 propyl 2 heptene 4 propyl heptane