CAS 3687-18-1 appears in our catalog under these names: 3-Aminopropane-1-sulfonic acid, 97% , Acamprosate Impurity 1（Acamprosate USP RC A）. Offered by: Thermo Scientific (Alfa Aesar), Hubei YoungXin. Available pack sizes: 1g, 5g, 25g, 10mg, 25mg, 50mg, 100mg, 200mg.