N-Pyrrolidino Metonitazene, also often called metonitazepyne, is often a artificial opioid. It has been described as a beige powder and is particularly reported for being administered by injection. There may be proof that its use causes substantial harm, together with death. It has no identified therapeutic use. A 2017 overview https://goo.gl/maps/kyMiFZydmjf97mh8A