<unk>  is a drug which is an analogue of the opioid analgesic methadone, where the metabolically labile dimethylamino group has been<unk> eplaced by a piperidinospiro group. It is around 212x more potent than methadone as an analgesic in animal tests, with an effective oral dosage of 0.07mg/kg, but is slightly shorter acting, with a duration of action of around 3 hours.<unk>  has never been used in humans, but would be expected to produce effects similar to those of other potent opioid agonists, including strong analgesia, sedation, euphoria, constipation, itching and<unk> espiratory depression which could be harmful or fatal.
R-4066
BBR3464
DPI-287
BU-48
TRPA 
STD
Picloxydine
EMPC