Notes: Acetaminophen-d4 (Item No. 22645) is an analytical reference material intended for use as an internal standard for the quantification of acetaminophen (Item Nos. 22629 / 10024) by GC- or LC-MS. Acetaminophen is categorized as an analgesic and antipyretic. Acetaminophen is reportedly used as a cutting agent in heroin (Item Nos. 9001543 / ISO60187).{31650} This product is intended for analytical forensic applications. This product is also available as a general research tool (Item No. 18245).