CAS 2601437-72-1 appears in our catalog under these names: 2,5-Dioxopyrrolidin-1-yl 3-oxo-1-(pyridin-2-yldisulfaneyl)-7,10,13,16,19,22,25,28,31,34,37,40-dodecaoxa-4-azatritetracontan-43-oate, 95%, 95%, SPDP–PEG12–NHS ester, SPDP-PEG12-NHS ester 95+%, SPDP-PEG12-NHS ester. Offered by: Chemat, GLPBio, Ambeed, MedChemExpress. Available pack sizes: 50mg, 100mg, 250mg, 1g, 500mg, 25 mg, 10 mg, 5 mg.