50957-55-6 (2S,8E,16S,17S,18R,19R,20R,21S,22R,23S,24E)-5,6,17,19-tetrahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-1,9,11-trioxo-8-[(propoxyamino)methylidene]-1,2,8,9-tetrahydro-2,7-(epoxypentadeca[1,11,13]trienoimino)naphtho[2,1-b]furan-21-yl acetate [50957-55 61102-55-4 (1alpha,5beta,6beta,8alpha,9beta,10alpha,16beta)-17-(ethylsulfanyl)-1,6,7,14-tetrahydroxy-7,20-epoxykauran-15-one