after the intraportal injection of retinoic acid-15- ( 14 ) c into rats , all-trans methyl retinoate , a cis isomer of methyl retinoate , retinoyl beta-glucurono-gamma-lactone , retinoic acid , and retinoyl beta-glucuronide were isolated from methanol extracts of rat bile by chromatography on anion-exchange resin and silicic acid columns and characterized on thin-layer plates of silica gel g .
C0037105
silicic acid
C2936385
silica