in this rapid tlc method of analysis for the urinary cannabinoid metabolite , 11-nor-delta 9-tetrahydrocannabinol-9-carboxylic acid ( thc-cooh ) , hydrolyzed urine specimens are aspirated through a porous , alkyl-silica extraction layer located along the lower edge of a biphasic thin-layer chromatogram ;
C0006864
cannabinoid
C0039663
thc