CAS 21306-56-9 appears in our catalog under these names: QX 314/ 98%, Lidocaine N-ethyl bromide, 99+ , QX 314, QX-314 1PC X 100MG. Offered by: TargetMol, Thermo Scientific (Alfa Aesar), Biosynth, Chemat, Sigma-Aldrich. Available pack sizes: 5mg, 10mg, 25mg, 50mg, 100mg, 200mg, 0,25g, 0,5g.