CAS 273-94-9 appears in our catalog under these names: 1H-Imidazo(4,5-b)pyrazine, 1H-Imidazo[4,5-b]pyrazine 97%, 1H-imidazo[4,5-b]pyrazine, 97%, 97%, 1H-Imidazo[4,5-b]pyrazine, 98%. Offered by: Biosynth, Ambeed, Chemat, Fluorochem. Available pack sizes: 10g, 1g, 100mg, 250mg, 5g, 500mg, 25g.