CAS 2138439-56-0 appears in our catalog under these names: 2-(2,6-Dioxopiperidin-3-yl)-4-((2-(2-(prop-2-yn-1-yloxy)ethoxy)ethyl)amino)isoindoline-1,3-dione 95%, Pomalidomide-PEG2-propargyl, 2-(2,6-Dioxo-3-piperidinyl)-4-[[2-[2-(2-propyn-1-yloxy)ethoxy]ethyl]amino]-1H-isoindole-1,3(2H)-dione, 98%. Offered by: Ambeed, Chemat, Fluorochem. Available pack sizes: 50mg, 100mg, 250mg, 1g.