(1R,4R)-2-[2-(3,4-Dichloro-phenyl)-ethyl]-1-((S)-1,2-dihydroxy-ethyl)-3-oxo-2,5-diaza-spiro[3.4]octane-5-carboxylic acid benzyl ester

(1R,4R)-2-[2-(3,4-Dichloro-phenyl)-ethyl]-1-formyl-3-oxo-2,5-diaza-spiro[3.4]octane-5-carboxylic acid benzyl ester

(5aR,12S,14aS)-12-isobutyl-11-isopentyl-9-methoxy-1,2,3,5a,6,11,12,14a-octahydro-5H,14H-pyrrolo[1'',2'':4',5']pyrazino[1',2':1,6]pyrido[3,4-b]indole-5,14-dione

methyl 1-carbobenzyloxy-2S-pyrrolidinyl-αS-azidoacetate

(S)-benzyl 2-((S)-2-((tert-butyldimethylsilyloxy)methyl)-piperidine-1-carbonyl)pyrrolidine-1-carboxylate