Unlabelled Compounds HRCC1 HRCC2 HRCC3 HRCC4 HRCC52,3,7,8-TetraCDD. 1.0.2.5 . 10 50 . 2002,3,7,8-TetraCDF . 1.0.2.5 . 10 50 . 2001,2,3,7,8-PentaCDD. 2.5.6.25 . 25 125 . 5001,2,3,7,8-PentaCDF . 2.5.6.25 . 25 125 . 5002,3,4,7,8-PentaCDF . 2.5.6.25 . 25 125