TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The salt is a calcium salt.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The organic solvent is an 1-4C-alcohol, or a non polar solvent, such as toluene (preferred), xylene and/or 1,4-dioxane. The weight ratio of organic solvent to solid is 100:1-5:1, preferably 10:1. ACTIVITY - Antidiabetic.    MECHANISM OF ACTION - None given.    EXAMPLE - 85 g of (3aR,7aS)-Octahydro-1H-isoindole hydrochloride and 100 g of (S)-3-benzyldihydrofuran-2,5-dione were mixed in 700 ml of methylene chloride to obtain a reaction mixture. The mixture was treated with 384 ml of a solution of 3N sodium hydroxide and then, stirred at 23 degrees C for 1 hour. 40 ml of 3N Hydrochloric acid was added to the mixture. The organic layer was washed with 400 ml of water. The organic phase was concentrated under reduced pressure and 500 ml of ethyl acetate was added to the residue to obtain 68.8 g of (3S)-3-benzyl-4-(hexahydro-1H-isoindol-2(3H)-yl)-4-oxobutanoic acid. The mother liquors containing (S)-2-benzyl-4-((3aR,7aS)-hexahydro-1H-isoindol-2(3H)-yl)-4-oxobutanoic acid was separated from the first cycle. 690 ml of Toluene was added to the 68.8 g of obtained in the precedent step and heated to reflux for 30 minutes. Then, the solvent was distilled under vacuum. 700 ml of Ethyl acetate was added to the residue obtaining a filtered residue of 46.8 g of (3S)-3-benzyl-4-(hexahydro-1H-isoindol-2(3H)-yl)-4-oxobutanoic acid from the second cycle. The mother liquors containing (S)-2-benzyl-4-((3aR,7aS)-hexahydro-1H-isoindol-2(3H)-yl)-4-oxobutanoic acid was separated from the second cycle. 470 ml of Toluene was added to the 46.8 g of obtained in the precedent step and heated to reflux for 30 minutes. Then, the solvent was distilled under vacuum. 500 ml of Ethyl acetate was added to the residue obtaining a filtered residue of 27.7 g of (3S)-3-benzyl-4-(hexahydro-1H-isoindol-2(3H)-yl)-4-oxobutanoic acid from the third cycle. The mother liquors containing (S)-2-benzyl-4-((3aR,7aS)-hexahydro-1H-isoindol-2(3H)-yl)-4-oxobutanoic acid was separated from the third cycle. The mother liquors containing compounds were mixed, the solvent was distilled under vacuum. The residue was dissolved in 1.9 l of ethanol and then, 77.9 ml of a solution of 6N sodium hydroxide was added. 166 g of Calcium chloride dehydrate in 2 l of water were mixed and vigorously stirred to obtain the crystals that were separated by filtration and worked up to give 55% of bis((2S)-2-benzyl-3-(cis-hexahydroisoindolin-2-ylcarbonyl)propionate)dihydrate calcium salt.