Talk:U-49900 - PsychonautWiki

Talk:U-49900

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U-49900 is a synthetic opioid. Due to its relationship to U-47700 and U-48800 and possible toxicity, it is highly advised against taking this substance.

https://www.reddit.com/r/researchchemicals/comments/5gbo3e/u49900_experiment_and_warning/

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