1-methyl-4-(2-methylbut-3-en-2-ylsulfonyl)benzene

dimethyl 2-(2-methylbut-3-en-2-yl)propanedioate

dimethyl (3-methyl-2-butenyl)propanedioate

methyl 2-(benzenesulfonyl)-3,3-dimethylpent-4-enoate

methyl 5-methyl-2-(phenylsulfonyl)hex-4-enoate