the enantiomers of dbajac-3,4-dhd were prepared from the separable diastereoisomeric esters with ( + ) -endo-1,4,5,6,7,7-hexachlorobicyclo [ 2.2.1 ] hept-5-ene-2-carboxyl ic acid ( hca ) .
C0014898
esters
C0007066
carboxyl