Research Chemical 5-APB is the replacement for the well-known Benzofury (6-APB). Only available in powder. It is comparable to the effects of MDMA and after 2-3 hours you will have reached the peak.
In 1993, this RC was first synthesized by psychedelic chemist and researcher David E. Nichols. However, it wasn't until 10 years later that its popularity rose for recreational use. It was sold along with other new benzofuran entactogens under the name Benzofury
Read more about 5APB at psychonautwiki