CAS 326003-46-7 appears in our catalog under these names: 3-(2-Maleimidoethylcarbamoyl)(peg12)propionic acid N-hydroxysuccinimide ester, 95%, Mal-amido-PEG24-NHS, 95%, mal-PEG(12)-NHS, mal-PEG(24)-NHS, Mal-PEG12-NHS. Offered by: Combi-blocks, Iris Biotech, Biosynth. Available pack sizes: 100mg, 500mg, 1g, 25mg, 50mg.