(5R,6E)-5-Hydroxy-1,7-diphenyl-6-hepten-3-one (Standard) is the analytical standard of (5R,6E)-5-Hydroxy-1,7-diphenyl-6-hepten-3-one. This product is intended for research and analytical applications. (5R,6E)-5-Hydroxy-1,7-diphenyl-6-hepten-3-one is the methylene chloride extract of Alpinia nutans, has antioxidant activity[1].