9-[1-(4-Methoxy-phenyl)-meth-(Z)-ylidene]-9H-indeno[2,1-b]pyridine
9-[1-(4-Methoxy-phenyl)-meth-(E)-ylidene]-9H-indeno[2,1-b]pyridine
N-(p-nitrobenzoyl)-1-azafluorenium chloride
9-[1-(3,4-Dimethoxy-phenyl)-meth-(Z)-ylidene]-9H-indeno[2,1-b]pyridine
9-[1-(3,4-Dimethoxy-phenyl)-meth-(E)-ylidene]-9H-indeno[2,1-b]pyridine