Erowid References Database
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Knaus EE, Warren BK, Ondrus TA.
“US Patent 4,468,403 : Analgesic Substituted Piperidylidine-2-sulfon(cyan)amide derivatives”.
USPTO. 1984 aug 28.
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Abstract
A patent covering mu-opioid agonists named W-1 through W-32, including W-15 and W-18 that have been sold by research chemical vendors in 2014.
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