We　developed　a　new　efficient　photolabile　protecting　group,　2-(2-nitrophenyl)　propyl　(Npp)　that　blocks　the　carboxyl　group　in　peptide　synthesis.　The　Npp　group　is　quite　compatible　with　the　Fmoc-t-Bu　strategy　and　can　be　removed　rapidly　and　quantitatively　by　irradiation　with　UV　light.　Using　this　method,　we　prepared　a　head-to-tail　cycloheptapeptide.