U-48800 is an opioid analgesic drug analogue of originally U-47700,just added one methylene on the benzene ring,at the same time, 2,4-dichlorophenyl replaced the 3,4-dichlorophenyl. U-48800 is selective for the µ–opioid receptor, having around 7.5 x the potency of morph in animal models. Research results shows that U-48800 has the same potency level as originally U-47700. Use for laboratory research only, not for human consumption.