140367-81-3

7,11:18,22-Dimethano-4H,6H-dipyrido[1,2-a:1',2'-i][1,5,9,13]tetraazacyclohexadecine-9,20(10H,19H)-dicarboxaldehyde,7,8,11,15,17,18,21,22-octahydro-4,15-dioxo-, (7R*,11R*,18S*,22S*)-(+)-