1 acid has been the most widely employed photolabile support for the generation of both peptide acids and amides. 2 Photolabile amide protecting groups for C-termini of peptides which rely on the same basic o-nitrohenzyl chemistry have also been rep~ rted.~ The rapidly growing field of combinatorial organic synthesis4 involving libraries of peptides and small molecules has markedly renewed interest in the use of photolabile linkers for the release ...