1 hour further 2 81 ml 29 mmol of diethylamine was added followed by stirring at room temperature for 12 hours the reaction product was extracted with two 100 ml portions of ethyl acetate the organic layer was dried with anhydrous magnesium sulfate and filtered the solvent was distilled away from the filtrate under reduced pressure thus there was obtained the compound iiiaa in an amount of 3 20 g yield 83 the compound iiiaa was found to have the same property values as the compound iiiaa obtained in example 26 to 100 ml of methylene chloride solution containing 8 35 g 30 5 mmol of a mixture of the compounds iiaa and iiab was added 12 8 ml 91 6 mmol of triethylamine to the reaction mixture cooled to 0 u00b0 c was added dropwise with stirring 3 6 ml 45 8 mmol of methylsulfonyl chloride followed by stirring at 0 u00b0 c for 40 minutes 50 ml of a saturated aqueous solution of sodium hydrogen carbonate was added the reaction mixture was warmed to room temperature and stirred for 1 hour further 7 8 ml 76 3 mmol of diethylamine was added followed by stirring at room temperature for 12 hours the reaction product was extracted with three 30 ml portions of ethyl acetate the organic layer was dried with anhydrous magnesium sulfate and filtered the solvent was distilled away from the filtrate under reduced pressure the crude product was.