Orthanilic acid, also known as 2-aminobenzenesulfonic acid, can exist in different protonation states depending on the pH of the solution. At lower pH values (acidic conditions), it can exist as the protonated form, which may interact with peptides through electrostatic interactions.
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methyl ((2-(2-(2-((tert-butoxycarbonyl)amino)-4-methylpentanamido)-2-methylpropanamido)phenyl)sulfonyl)-L-prolinate
