title: Chemical synthesis and biological occurrence of carboxylic acid metabolites of delta1(6)-tetrahydrocannabinol.
abstract: Potential metabolites of (-)-3,4-trans-tetrahydrocannabinol (THC) with a carboxylic acid function in the side chain were synthesized as their methyl esters in the delta1(6)-series. The chromatographic and mass-spectrometric properties of the five side-chain homologues were examined and utilized to facilitate the isolation and the identification of the corresponding monocarboxylic acid metabolites of delta1(6)-THC in the mouse, guinea pig, and rabbit formed after ip administration. The metabolites were identified by gas chromatography and mass fragmentography. In mouse liver delta1(6)-THC-7-oic acid and 3'',4'',5''-trisnor delta1(6)-THC-2''-oic acid were identified as metabolites. In guinea pig liver these acids occurred together with 4'',5''-bisnor-delta1(6)-THC-3''-oic acid and 5''-nor-delta1(6)-THC-4''-oic acid. Rabbit liver contained delta1(6)-THC-7-oic acid, 2'',3'',4'',5''-tetranor-delta1(6)-THC-1''-oic acid and 4'',5''-bisnor-delta1(6)-THC-3''-oic acid. Further, the structure of three dicarboxylic acid metabolites of delta1(6)-THC in rabbit kidney were determined by mass spectrometry and proton  magnetic resonance spectroscopy.
mesh_terms: D000818:Animals; D002849:Chromatography, Gas; D013759:Dronabinol / Q000031:analogs & derivatives / Q000138:chemical synthesis* / Q000302:isolation & purification / Q000378:metabolism; D005260:Female; D006168:Guinea Pigs; D008297:Male; D013058:Mass Spectrometry; D051379:Mice; D011817:Rabbits; D013045:Species Specificity; D014018:Tissue Distribution
chemical_list: D013759:Dronabinol