CAS 7291-22-7 appears in our catalog under these names: Pyridine-d{5}, 99.5% (Isotopic) , Pyridine-d{5}, 99.5%(Isotopic) , Pyridine-d{5}, 99.5% (Isotopic), contains 0.05% v/v TMS , Pyridine-d{5}, 100%(Isotopic) . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 2g, 10g, 10each, 5g, 25g, 2each.