Acetic acid (1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-3a-[7-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-heptylcarbamoyl]-1-isopropenyl-5a,5b,8,8,11a-pentamethyl-icosahydro-cyclopenta[a]chrysen-9-yl ester

3-{7-[((1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-9-Acetoxy-1-isopropenyl-5a,5b,8,8,11a-pentamethyl-icosahydro-cyclopenta[a]chrysene-3a-carbonyl)-amino]-heptanoylamino}-propionic acid ethyl ester

5-{5-[((1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-9-Acetoxy-1-isopropenyl-5a,5b,8,8,11a-pentamethyl-icosahydro-cyclopenta[a]chrysene-3a-carbonyl)-amino]-pentanoylamino}-pentanoic acid methyl ester

11-({(1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bS)-9-Acetoxy-1-[1-(2-hydroxy-ethylsulfanylmethyl)-vinyl]-5a,5b,8,8,11a-pentamethyl-icosahydro-cyclopenta[a]chrysene-3a-carbonyl}-amino)-undecanoic acid methyl ester

4-{6-[((1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-9-Acetoxy-1-isopropenyl-5a,5b,8,8,11a-pentamethyl-icosahydro-cyclopenta[a]chrysene-3a-carbonyl)-amino]-hexanoylamino}-butyric acid methyl ester