U-49900 is an analogue of U-47700 created by replacing the two methyl in the tail ring with ethyl. Opioids are anti-depressants leading to euphoria. For the µ-opioid receptor, U-49900 is selective. This substance is hallucinogenic in nature creating distance between the user and the reality. Thus, it is advisable only for forensic research and not for consumption purposes. If you are carrying a research and are looking for U-49900, then purchase this drug online for effective rates. You can also place orders in bulk essential for academic research.