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The major metabolite of (-)-trans-Delta(8)-tetrahydrocannabinol observed in vivo and formed by hepatic microsomes in vitro is 11-hydroxy-trans-Delta(8)-tetrahydrocannabinol. The metabolite was identified spectroscopically and was synthesized from trans-Delta(8)-tetrahydrocannabinol. In tests with rats, the metabolite produced behavioral effects similar to those imparted by Delta(8)- and Delta(9)-tetrahydrocannabinol.
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Foltz et al. (1970) studied this question.
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