p. 1547 - 1548
(1984)4-(2-Benzyloxy-ethyl)-6,9-bis-(4-methoxy-benzyl)-2,2-dimethyl-1,3-dioxa-6,9-diaza-spiro[4.5]decane-7,10-dione
(1S,9R)-10,12-Bis-(4-methoxy-benzyl)-3,3-dimethyl-2,4,8-trioxa-10,12-diaza-tricyclo[7.2.2.01,5]tridecane-11,13-dione
4-(2-Hydroxy-ethyl)-6,9-bis-(4-methoxy-benzyl)-2,2-dimethyl-1,3-dioxa-6,9-diaza-spiro[4.5]decane-7,10-dione
9-Acetyl-4-(2-benzyloxy-ethyl)-2,2-dimethyl-1,3-dioxa-6,9-diaza-spiro[4.5]decane-7,10-dione
4-(2-Benzyloxy-ethyl)-2,2-dimethyl-1,3-dioxa-6,9-diaza-spiro[4.5]decane-7,10-dione