18 y/o M identified unresponsive in bed. Experienced a hx of ADHD and illicit drug use. Paraphernalia was found on scene and presumptively identified for being butyrylfentanyl and U-47700. U-49900 To begin with appeared online in 2016 on a well-liked drug forum1 by a drug user reporting its availability and https://prosyntheticchems.com/product/u-48800/