1-bromo-4-methyl-5-hydroxypent-1-en-3-one

5-bromo-1-hydroxy-2-methylpent-4-en-3-one

1-bromo-5-hydroxy-4-methylpent-1-en-3-one

5-bromo-2-methyl-3-oxopent-4-en-1-ol

1-bromo-4-methyl-3-oxopent-1-enol