KAREN A. MARLEY* and RICHARD A. LARSON Institute for Environmental Studies, University of Illinois, 1 101 West Peabody Drive, Urbana, IL 6 1801, USA ... Abstract-This paper presents the analysis and identification of an unstable product previously undescribed from furocoumarin photolysis, 5-formyl-6-hydroxybenzofuran. Reverse-phase chromatography and solid-phase extraction techniques allowed its isolation. ... INTRODUCTION In the characterization of ...