prov:value
| - Nos. 3,123,640; 3,123,641; 3,141,905 and 3,155,591, are represented by the formula wherein R is an alkyl radical containing from one to three carbon atoms, and more particularly from one to two carbon atoms, R, is an alkyl radical containing from one to three carbon atoms, and compounds wherein R and R, are joined together to form with the N atom a member of the group consisting of piperidine, met
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