CRYSTAL-STRUCTURES OF RAC-METHYL-(3R-STAR,3AS-STAR,4R-STAR,7R-STAR,7AR-STAR)-7-ACETOXYMETHYL)-3-BENZYL-4,5-DIMETHYL-1-OXO-3A,4,7,7A-TETRAHYDROISOINDOLINE-7A-CARBOXYLATE) AND RAC-(3R-STAR,3AS-STAR,4R-STAR,7R-STAR,7AS-STAR)-3-BENZYL-2-BENZYLOXYCARBONYL-4,5-DIMETHYL-7,7A-(3'-OXO-2'-OXATRIMETHYLENE)-3A,4,7,7A-TETRAHYDROISOINDOLIN-1-ONE)