An Fmoc-protected lysine glycation building block for solid-phase peptide synthesis (SPPS), with the side-chain amine Boc-protected. The Nα-Fmoc group is removed under standard piperidine conditions during chain elongation, while the free α-carboxylic acid couples to the resin-bound peptide; the Boc group is removed during global acidic deprotection. This is an Amadori-rearrangement (fructosamine) building block in which the lysine side chain carries a fructose-derived adduct (with the side-chain nitrogen Boc-protected), used to synthesize peptides modeling early non-enzymatic glycation, fructosyl-lysine, and AGE chemistry.