3-sulfanylpropanoyl (N-term and Lys) thioacylation of primary amines - site N-term 3,3-Dithio-bis-(sulfosuccinimidyl)propionate 87.99828338623046875 88.12000274658203125 C 3 H 4 O 1 S 1 MOD:01223 N-term PSI-MOD Thioacyl This Unimod entry is misdescribed as "thioacylation" [JSG]. Unimod:126 X artifact modification from Unimod Other - ntermpeptioacetyl thioacylation of primary amines (N-term and Lys)