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method for preparation of substituted derivatives of nitrogen of the carbethoxy - pyrrolidone, sludge of rotatory power to the preparation of hydroxy pyrrolidine nitrogen alcoyl - substituees opticallyactive and product obtained by this process
method for preparation of substituted derivatives of nitrogen of the carbethoxy - pyrrolidone, sludge of rotatory power to the preparation of hydroxy pyrrolidine nitrogen alcoyl - substituees opticallyactive and product obtained by this process