methyl (Z)-2-((benzyl(tert-butoxycarbonyl)amino)methyl)-4,4-dimethylpent-2-enoate

methyl (E)-2-((benzyl(tert-butoxycarbonyl)amino)methyl)-4,4-dimethylpent-2-enoate

methyl (E)-4,4-dimethyl-2-((2-oxooxazolidin-3-yl)methyl)pent-2-enoate

1-(4,4-dimethylpenta-1,2-dien-1-yl)pyridin-2(1H)-one