1889-99-2 2-Cyclopenten-1-one, 3-bromo-2-hydroxy-4,4,5,5-tetramethyl- 3-Bromo-2-hydroxy-4,4,5,5-tetramethylcyclopent-2-en-1-one 3-Bromo-2-hydroxy-4,4,5,5-tetramethylcyclopent-2-enone Bromo-2-hydroxy-4,4,5,5-tetramethylcyclopenten-3-one EINECS 217-570-3