CAS 3687-18-1 appears in our catalog under these names: 3-Aminopropane-1-sulfonic Acid (Homotaurine), 3-Aminopropane-1-sulfonic acid, 97% , 3-Amino-1-propanesulfonic acid, 95%, 3-Amino-1-propanesulfonic Acid 98%, 3-AMINO-1-PROPANESULFONIC ACID, 97%. Offered by: Mikromol, Thermo Scientific (Alfa Aesar), Thermo Scientific (Acros), Ambeed, Sigma-Aldrich. Available pack sizes: 4x25mg, 1g, 5g, 25g, 100g, 500g, 1000g, 1kg.