to determine what stereospecificity might exist for the stimulus properties of barbiturate isomers , one group of pigeons was trained to discriminate 5 mg/kg of ( s ) - ( - ) -pentobarbital from saline and another group was trained to discriminate 8 mg/kg of ( r ) - ( + ) -pentobarbital from saline .
C0004745
barbiturate
C0030883
pentobarbital