1-O-ethyl 4-O-methyl 3-methyl-2-oxobutanedioate

乙基3-氯-4-甲基苯甲酸酯

Ethyl 5-hydroxy-2-iodobenzoate

ethyl 4,8-dimethyl-(3E)-3,7-nonadienoate

ethyl 4,8-dimethylnona-3,7-dienoate