Cyclocondensation of a mixture of benzylamine (I), ethyl propiolate (II) and benzaldehyde (III) in hot AcOH furnished dihydropyridine (IV). Photodimerization of this compound in a MeOH-THF solution gave rise to the cage dimer (V). Finally, reduction of the ester groups of (V) by means of LiAlH4 at low temperature produced the title tetraol compound.