( ( One ( of ( ( a group ) ( of hydrocarbon ) ) ) ) ( ( compounds ( containing ( ( ( ( one or ) more ) ( six-carbon rings ) ) ( characteristic ( of ( the ( benzene series ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (CD One)) (PP (IN of) (NP (NP (DT a) (NN group)) (PP (IN of) (NP (NN hydrocarbon)))))) (VP (VBZ compounds) (S (VP (VBG containing) (NP (NP (QP (CD one) (CC or) (JJR more)) (JJ six-carbon) (NNS rings)) (ADJP (JJ characteristic) (PP (IN of) (NP (DT the) (JJ benzene) (NN series)))))))) (. .)))
One of a group of hydrocarbon compounds containing one or more six-carbon rings characteristic of the benzene series.
(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))))))) (. .)))