p. 2777 - 2780
(1999)p. 617 - 628
(1996)(1S,4R)-1,4-Bis-benzyloxymethyl-7-oxa-bicyclo[2.2.1]hepta-2,5-diene-2,3-dicarboxylic acid dimethyl ester
(1R,2R,4S,5S)-1,5-Bis-benzyloxymethyl-3,8-dioxa-tricyclo[3.2.1.02,4]oct-6-ene-6,7-dicarboxylic acid dimethyl ester
(1R,2R,4S,5S,6R,7S)-1,5-Bis-benzyloxymethyl-6,7-dihydroxy-3,8-dioxa-tricyclo[3.2.1.02,4]octane-6,7-dicarboxylic acid dimethyl ester