Product Name: 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-mpeg2000 (sodium salt) Cat.#: R-0028 CAS No : 147867-65-0 Appearance: White Powder Molecular Weight: 2800 Purity:99% Storage:-20℃ Stability:24months - See more at: http://www.resenbio.com/products-detail.php?ProId=53#sthash.7QyCQaaZ.dpuf