This chemical is the newest synthetic opioid to emerge on the illicit drug markets. In vitro data suggests that it has similar potency as fentanyl. It has appeared in both the US and Europe.
NPS Discovery reported that Brorphine has recently been identified in both Europe and the US. It is structurally similar to fentanyl.
https://www.npsdiscovery.org/wp-content/uploads/2020/07/Brorphine_071720_CFSRE-Toxicology_Report.pdf (Accessed online 24 July 2020)