CAS 56149-52-1 appears in our catalog under these names: 4-(4-Hydroxybutoxy)-4-oxobutanoic acid, 95%, (4-Hydroxybutyl) hydrogen succinate, Butanedioic acid,1-(4-hydroxybutyl) ester, 95%+, 95%+. Offered by: Combi-blocks, Biosynth, Chemat. Available pack sizes: 1g, 250mg, 100mg, 1000mg.