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

7,9-bis(p-methoxybenzyl)-7,9-diaza-6-hydroxy-5-vinylbicyclo<4.3.1>decane-8,10-dione

(1S,6R)-2-Eth-(Z)-ylidene-1-hydroxy-7,9-bis-(4-methoxy-benzyl)-7,9-diaza-bicyclo[4.2.2]decane-8,10-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