2-Azabicyclo[16.3.1]docos-1(21),4,6,10,18-pentaen- 3,20,22-trione, 9-aminocarbonyloxy-13-hydroxy- 8,14-dimethoxy-4,10,12,16-tetramethyl-19-[[2-(dimethylamino)ethyl]amino]-, stereoisomer Carbamic acid, [9-aminocarbonyloxy-13-hydroxy-8,14-dimethoxy- 4,10,12,16-tetramethyl- 19-[[2-(dimethylamino)ethyl]amino]- 3,20,22-trioxo-2-azabicyclo[16.3.1]docos-1(21),4,6,10,18- pentaen-9-yl] ester, stereoisomer NSC683659