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1 From The Burroughs Wellcome & Co. U.S.A. Experimental Research Laboratories, Tuckahoe, N. Y.
1. A series of 2-alkyl-1,2,3,4-tetrahydroisoquinoline homologs containing the normal arrangement of carbon atoms in the alkyl chain and another containing the iso-arrangement were tested for relative L 50 values in albino mice and for circulatory effects in atropinized, dial anesthetized dogs.
2. The L 50 values tend to decrease (increase in toxicity) with lengthening of the chain in the normal homologs but not to the degree found with homologous ureas. The iso-homologs showed no consistent trend with lengthening of the carbon chain.
3. These tetrahydroisoquinolines are essentially depressor in action.
Submitted on July 26, 1939
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