(S)-9-{(R)-2-[2-[(S)-1-(9H-Fluoren-9-ylmethoxycarbonylamino)-ethyl]-benzo[d][1,3]oxazin-(4Z)-ylideneamino]-2-methoxycarbonyl-ethyl}-2-methyl-3-oxo-2,3-dihydro-imidazo[1,2-a]indole-1-carboxylic acid benzyl ester

2,2,2-trichloroethyl ((2R,2'S,4R,9a'R)-2'-methyl-3',5-dioxo-1',2',3',4,5,9a'-hexahydro-3H-spiro[furan-2,9'-imidazo[1,2-a]indol]-4-yl)carbamate

methyl (2S,9R,9aS,αR)-9-hydroxy-α-[[(2,2,2-trichloroethoxy)carbonyl]amino]-2-methyl-3-oxo-1-[(phenylmethoxy)carbonyl]-2,3,9,9a-tetrahydro-1H-imidazo(1,2-a)indole-9-propanoate

methyl (2S,9S,9aR,αR)-9-hydroxy-α-[[(2,2,2-trichloroethoxy)carbonyl]amino]-2-methyl-3-oxo-1-[(phenylmethoxy)carbonyl]-2,3,9,9a-tetrahydro-1H-imidazo(1,2-a)indole-9-propanoate

(9H-fluoren-9-yl)methyl (2R,2'S,4R,9a'S)-4-(2-aminobenzamido)-2'-isobutyl-3',5-dioxo-2',3',4,5-tetrahydro-3H-spiro[furan-2,9'-imidazo[1,2-a]indole]-1'(9a'H)-carboxylate