In organic chemistry, a propynyl functional group is a propyl bearing a triple bond. The 1-propynyl group has the structure CH3-C≡C-R. The 2-propynyl group is also known as a propargyl group, and has the structure HC≡C−CH2-R. ...
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http://en.wikipedia.org/wiki/Propynyl
[psychedelic] Propynyl, or 4-propynyloxy-3,5-dimethoxyphenethylamine, is a lesser-known psychedelic drug. It is closely related in structure to mescaline. Propynyl was first synthesized by Alexander Shulgin. In his book PiHKAL (Phenethylamines i Have Known And Loved), the minimum dosage is listed as 80 mg, and the duration listed as 8–12 ...
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http://en.wikipedia.org/wiki/Propynyl_(psychedelic)
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