4-甲氧基丁-2-酮

(E)-3-methoxy-1-methyl-1-propenyl 3-bromo-2-methoxy-2-methyl-3-butenoate

(E)-3-methoxy-1-methyl-1-propenyl (E)-3-bromo-4-methoxy-2-methyl-2-butenoate

methyl (E)-3-bromo-4-methoxy-2-methyl-2-butenoate

1,1,2-tribromo-2-methylcyclopropane