[[3-(2-tert-Butoxycarbonylamino-3-hydroxy-propyl)-1H-indol-4-yl]-(4-nitro-benzyloxycarbonyl)-amino]-acetic acid 2,5-dioxo-pyrrolidin-1-yl ester
[[3-(2-tert-Butoxycarbonylamino-3-hydroxy-propyl)-1H-indol-4-yl]-(4-nitro-benzyloxycarbonyl)-amino]-acetic acid ethyl ester
[[3-(2-tert-Butoxycarbonylamino-3-hydroxy-propyl)-1H-indol-4-yl]-(4-nitro-benzyloxycarbonyl)-amino]-acetic acid
[[3-(2-Amino-3-hydroxy-propyl)-1H-indol-4-yl]-(4-nitro-benzyloxycarbonyl)-amino]-acetic acid 2,5-dioxo-pyrrolidin-1-yl ester
[3-(2-tert-Butoxycarbonylamino-3-hydroxy-propyl)-1H-indol-4-ylamino]-acetic acid ethyl ester