3-methyl- 1-4-(1-methylprop-1yny1)-1-heptyne
3,5-dimethyl-4-propyhept-6-en-1-yne
3-methyl- 1-4-(3-methylprop-1eny1)-1-heptyne
3-5-Dimethyl-4-propylhept-1-en-6-yne
3,5-Dimethyl-4-propylhept-1-en-6-yne. Longest carbon chain, including multiple bonds, and numbering starts from the double bond.