reagent derivatized residue Uniblue A derivatized residue 1-amino-4-{[3-(ethenylsulfonyl)phenyl]amino}-9,10-dioxo-9,10-dihydroanthracene-2-sulfonic acid 1-amino-9,10-dioxo-4-{[3-(vinylsulfonyl)phenyl]amino}-9,10-dihydroanthracene-2-sulfonic acid 484.039886474609375 484.5 A protein modification that is produced by formation of an adduct with 1-amino-4-{[3-(ethenylsulfonyl)phenyl]amino}-9,10-dioxo-9,10-dihydroanthracene-2-sulfonate, Uniblue A. C 22 H 16 N 2 O 7 S 2 MOD:01659 PSI-MOD This reagent has a reactive sulfonyl vinyl and typically reacts with the free thiol group of cysteine residues. Uniblue A UniblueARes X artifact