CAS 2141976-24-9 appears in our catalog under these names: rel-2,5-Dioxopyrrolidin-1-yl 1-((1R,8S,9s)-bicyclo[6.1.0]non-4-yn-9-yl)-3-oxo-2,7,10,13-tetraoxa-4-azahexadecan-16-oate 98%, endo-BCN-PEG3-NHS ester. Offered by: Ambeed, MedChemExpress. Available pack sizes: 25mg, 50mg, 100mg, 250mg, 100 mg, 25 mg, 50 mg, 250 mg.