This compound, 2-(((9H-Fluoren-9-yl)methoxy)carbonyl)isoindoline-1-carboxylic acid, is the N-Fmoc protected derivative of isoindoline-1-carboxylic acid. It serves as a building block in solid-phase peptide synthesis (SPPS) to incorporate the isoindoline residue into peptide chains. The fluorenylmethoxycarbonyl (Fmoc) group protects the isoindoline nitrogen, providing stability under peptide coupling conditions while allowing easy removal under mild basic conditions with piperidine. This enables efficient, stepwise peptide assembly. The isoindoline moiety enhances compound stability and handling. Essential for peptide production in pharmaceutical research, drug development, and biochemical studies.