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Smythies JR, Johnston VS, Bradley RJ, Benington F, Morin RD, Clark jun LC. 
“Some New Behaviour-disrupting Amphetamines and their Significance”. 
Nature. 1967 Oct 14;216:128-129.
The effect of a series of amphetamines has been investigated, and the results suggest that substitution in the para-position is important for hallucinogenic properties.
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