An object of the invention is to provide a laminate which is good in adhesiveness between a substrate and a thin film laminated thereon by a dry film-forming method such as a chemical vapor growth method or a vacuum evaporation method even if the substrate is a polymer substrate made of a nonpolar polymer; and a process for producing the same. The polysaccharide adsorbs on the ware resulting in a sheeting action of the rinse solution leading to improved drying of the ware. An optically active 3,5-dihydroxyhexanoic acid derivative is produced by asymmetrical hydrogenation of an optically active 3-oxo-5-hydroxyhexanoic acid derivative catalyzed by an RuBr2BINAP complex prepared from a ruthenium complex and a ruthenium-optically active phosphine complex, i.