para-methyl Tetrahydrofuran fentanyl (hydrochloride) (Item No. 23054) is an analytical reference standard that is structurally similar to known opioids. It is a methyl-substituted version of tetrahydrofunan fentanyl (Item No. 20859). para-methyl Tetrahydrofuran fentanyl is regulated as a Schedule I compound in the United States. This product is intended for research and forensic applications.WARNING This product is not for human or veterinary use.