ÃÂ<sup>7</sup>-Tetrahydrocannabinol (Delta-7-THC, ÃÂ<sup>7</sup>-THC; alternatively numbered as ÃÂ<sup>5</sup>-tetrahydrocannabinol, ÃÂ<sup>5</sup>-THC) is a synthetic isomer of tetrahydrocannabinol. The (6aR,9S,10aR)-ÃÂ<sup>7</sup>-THC epimer is only slightly less potent than ÃÂ<sup>9</sup>-THC itself, while the (9R) epimer is much less potent.