15H-16,1,14-[1,2]Propanediyl[3]ylidene-7H,14H-azacyclodocosino[10,11,12-ij]quinolizin-7-one,1,2,3,5,6,7a,8,9,10,11,12,13,17,18,19,20,21,22,23,24,25,26,26a,26b-tetracosahydro-,(1S,7aR,26aS,26bR)-[partial]-