3-bromo-2-hydroxycyclopent-2-en-1-one

2,3-Dibrom-2-acetoxy-cyclopentanon

Acetic acid 3-bromo-5-oxo-cyclopent-1-enyl ester

3,5,5-Tribrom-cyclopenten-(2)-ol-(2)-on

cyclopent-1-ene-3,4-dione