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d 2,4 dihydroxy - 3.3 - dimethylbutansäurenitril, its production and use and method for the production of d - pantolacton, d 2,4 dihydroxy - 3.3 - dimethylbutansäureamid and d - pantothenic acid
d 2,4 dihydroxy - 3.3 - dimethylbutansäurenitril, its production and use and method for the production of d - pantolacton, d 2,4 dihydroxy - 3.3 - dimethylbutansäureamid and d - pantothenic acid