6-methoxy-3,3,6-trimethylhepta-1,4-diyne

9-methoxy-3,3,6,6,9-pentamethyldeca-1,4,7-triyne

4-methoxy-4-methyl-1-(4-nitrophenyl)pent-2-yn-1-one

6-methoxy-6-methylhepta-2,4-diyn-1-ol