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Talk:U-49900: Difference between revisions
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U-49900 is a synthetic [[Opioids|opioid]] | U-49900 is a synthetic [[Opioids|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/ | |||