(+/-)-5-hydroxymethyl-3,5-dimethyl-4-(methoxymethoxy)-5H-thiophen-2-one

2-甲基-3-氧代戊酸甲酯

methyl 4-acetylsulfanyl-2-methyl-3-oxopentanoate

methyl 4-bromo-2-methyl-3-oxopentanoate