Isolation and characterization of two major urinary metabolites of 1 -tetrahydrocannabinol

Two of the major metabolites which appear in rabbit urine after the administration of Delta(1)-tetrahydrocannabinol have been isolated and their structures have been tentatively established. The available evidence indicates that they are 7-carboxy-Delta(1)-tetrahydrocannabinols with an additional hydroxyl group on the side chain. The substances occur both free and as conjugates.