(2S)-1-Tritylpyrrolidine-2-carboxylic acid (also named as Trityl-L-Proline,TRT-PRO-OH, n-tritylproline) is a tritylpyrrolidine building block that is typically used in the synthesis of N-Trityl Amino Acids.
Efficient "One-Pot" Synthesis of N-Trityl Amino Acids. 
Preparation and properties of enantiomerically pure Nα-tritylamino acid fluorides. 
A practical two-step procedure for the preparation of enantiopure pyridines: Multicomponent reactions of alkoxyallenes, nitriles and carboxylic acids followed by a cyclocondensation reaction. 
 K.Barlos, et al, J. Org. Chem., 1982, pp 47(7), pp 1324-1326.