巴豆酸叔丁酯

isopropyl 3,3-dimethyl-acrylate

2,4,4-trimethyl-5-methylene-4,5-dihydro-3-furoic acid

methyl 5-hydroxy-2,4,4,5-tetramethyl-4,5-dihydro-3-furoate

3-Hydroxy-2,2,3-trimethyl-5-oxo-cyclopentanecarboxylic acid methyl ester