5-methyl-3-propan-2-ylhex-1-yn-3-ol

3-tert-butyl-5-methylhex-3-en-1-yne

5-methyl-3-propan-2-ylhex-3-en-1-yne

5-tert-butyl-7-methyloct-5-en-3-yn-2-ol

7-methyl-5-propan-2-yloct-5-en-3-yn-2-ol