5-(hydroxymethyl)-2,3-dimethylcyclopent-2-en-1-one

4-methyl-N,N-dipropylpent-3-en-1-yn-1-amine

3-methylselenophene

ethyl (2Z)-3-ethoxy-4-methylpenta-2,4-dienoate

3,3-diethoxy-4-methyl-pent-4-enoic acid ethyl ester