4-(2-aminoethyl)benzenesulfonyl fluoride derivatized residue modified L-serine residue O-[4-(2-aminoethyl)benzenesulfonyl] serine 183.035400390625 183.2299957275390625 270.067413330078125 270.29998779296875 A protein modification that is produced by formation of an adduct with 4-(2-aminoethyl)benzenesulfonyl fluoride, AEBS, and an L-serine residue. AEBS Aminoethylbenzenesulfonylation C 11 H 14 N 2 O 4 S 1 C 8 H 9 N 1 O 2 S 1 MOD:01273 PSI-MOD S Unimod:276 artifact