( ( One ( of ( ( the ( most potent ) ) ( of these ) ) ) ) ( ( are ( in ( the ( aryl ( hydrocarbon group ) ) ) ) ) . ) )
(ROOT (S (NP (NP (CD One)) (PP (IN of) (NP (NP (DT the) (RBS most) (JJ potent)) (PP (IN of) (NP (DT these)))))) (VP (VBP are) (PP (IN in) (NP (DT the) (JJ aryl) (NN hydrocarbon) (NN group)))) (. .)))
One of the most potent of these are in the aryl hydrocarbon group.
(ROOT (S (NP (DT A) (NN lipid)) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT a) (ADJP (RB highly) (JJ diverse)) (NN group)) (PP (IN of) (NP (NP (NNS compounds)) (VP (VBN made) (PRT (RP up)) (ADVP (RB mostly))))) (PP (IN of) (NP (NNS hydrocarbons))))))) (. .)))