Transformation of quaternary 5-benzyl-2-(2-ethoxy-2-oxoethyl)- and -2-cyanomethyl-2-methyl-2,3,4,4a,5,9b-hexahydro-1H-pyrido[4,3-b]indol-2-ium salts into 1,2,3,4,7,12-hexahydroazonino[4,5-b]indole derivatives

[No abstract available]