p. 5041 - 5048
(2008/02/13)(2010/02/08)
(3R,4S)-3-[(5-chloro-thiophene-2-carbonyl)-amino]-4-[4-(2-oxo-2H-pyridin-1-yl)-benzoylamino]-pyrrolidine-1-carboxylic acid 9H-fluoren-9-yl methyl ester
5-Chlorothiophene-2-carboxylic acid
(3R,4S)-3-tert-butoxycarbonylamino-4-[4-(2-oxo-2H-pyridin-1-yl)-benzoylamino]-pyrrolidine-1-carboxylic acid 9H-fluoren-9-ylmethyl ester
4-(2-oxopyridine-1-(2H)-yl)benzoic acid