CAS 91574-33-3 appears in our catalog under these names: 2,5-Dioxopyrrolidin-1-yl 2-(4-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)phenyl)acetate, 98%, Mal-PhAc-NHS, 2,5-Dioxopyrrolidin-1-yl 2-(4-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)phenyl)acetate 98%, 2,5-Dioxopyrrolidin-1-yl 2-(4-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)phenyl)acetate, 98%, 98%. Offered by: AmBeed, Iris Biotech, Chemat, Fluorochem. Available pack sizes: 5g, 250mg, 1g, 100mg, 10g.