21457-21-6 5H-Thiazolo(3,2-a)pyrimidin-7-ol, 6,7-dihydro-3,5,5,7-tetramethyl-, monohydrobromide 6,7-Dihydro-3,5,5,7-tetramethyl-5H-thiazolo(3,2-a)pyrimidin-7-ol hydrobromide