(2R,3R)-1-[4-(2-Ethyl-benzyloxy)-benzenesulfonyl]-3-methyl-aziridine-2-carboxylic acid tert-butyl ester

(2R,3S)-1-[4-(2-Ethyl-benzyloxy)-benzenesulfonyl]-3-methyl-piperazine-2-carboxylic acid tert-butyl ester

(2R,3S)-4-Acetyl-1-[4-(2-ethyl-benzyloxy)-benzenesulfonyl]-3-methyl-piperazine-2-carboxylic acid tert-butyl ester

(2R,3S)-2-[4-(2-Ethyl-benzyloxy)-benzenesulfonylamino]-3-(2-hydroxy-ethylamino)-butyric acid tert-butyl ester

4-(2-Ethyl-benzyloxy)-N-[(1R,2S)-2-hydroxy-1-(4-methyl-2,6,7-trioxa-bicyclo[2.2.2]oct-1-yl)-propyl]-benzenesulfonamide