for the following products
(2R)-2-[(2-Methylpropan-2-yl)oxycarbonylamino]-3-(1-tritylimidazol-4-yl)propanoic acid | (R)-2-((tert-Butoxycarbonyl)amino)-3-(1-trityl-1H-imidazol-4-yl)propionic acid | N-alpha-tert-Butyloxycarbonyl-N-im-trityl-D-histidine and Boc-D-His(Trt)-OH
