The RCS-4 M10 metabolite, specifically the RCS-4 N-(5-hydroxypentyl)phenol metabolite, is primarily relevant in forensic and toxicological studies. It is used as a biomarker for detecting the consumption of synthetic cannabinoids, particularly RCS-4, in biological samples such as urine or blood. This metabolite helps in identifying and confirming the use of RCS-4 in drug testing scenarios, aiding law enforcement and medical professionals in assessing substance abuse cases. Its detection is crucial for monitoring compliance with drug regulations and for understanding the metabolism of synthetic cannabinoids in the human body.