8,10-bis(p-methoxybenzyl)-8,10-diaza-6-<(tert-butyldimethylsilyl)oxy>-1-methyl-5-ethenylbicyclo<4.2.2>decane-7,9-dione

(Z)-11,13-bis(p-methoxybenzyl)-11,13-diaza-9-methyl-2-oxabicyclo<7.2.2>tridec-4-ene-10,12-dione

8,10-bis(p-methoxybenzyl)-8,10-diaza-6-hydroxy-1-methyl-5-ethenylbicyclo<4.2.2>decane-7,9-dione

(Z)-11,13-bis(p-methoxybenzyl)-11,13-diaza-2-oxabicyclo<7.2.2>tridec-4-ene-10,12-dione