DL-erythro-PPMP is an inactive stereoisomer of DL-threo-PPMP (Item No. 17236).1 It has no effect on glucosylceramide synthetase activity and is used as a negative control for DL-threo-PPMP, D-threo-PPMP (Item No. 22677), and L-threo-PPMP (Item No. 24525) inhibitory activity. [Matreya, LLC. Catalog No. 1753]WARNING This product is not for human or veterinary use.