( ( ( Organic compounds ) ( of ( the ( same group ) ) ) ) ( ( are ( differentiated ( by ( ( the size ) ( of ( ( ( ( the ( hydrocarbon group ) ) ( -LRB- ( R -RRB- ) ) ) ( they ( are ( found on ) ) ) ) ( -LRB- ( ( ( a hydrocarbon ) ( is ( ( a compound ) ( composed ( of ( ( hydrogen and ) carbon ) ) ) ) ) ) -RRB- ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Organic) (NNS compounds)) (PP (IN of) (NP (DT the) (JJ same) (NN group)))) (VP (VBP are) (VP (VBN differentiated) (PP (IN by) (NP (NP (DT the) (NN size)) (PP (IN of) (NP (NP (NP (DT the) (NN hydrocarbon) (NN group)) (PRN (-LRB- -LRB-) (NP (NN R)) (-RRB- -RRB-)) (SBAR (S (NP (PRP they)) (VP (VBP are) (VP (VBN found) (PRT (RP on))))))) (PRN (-LRB- -LRB-) (S (NP (DT a) (NN hydrocarbon)) (VP (VBZ is) (NP (NP (DT a) (NN compound)) (VP (VBN composed) (PP (IN of) (NP (NN hydrogen) (CC and) (NN carbon))))))) (-RRB- -RRB-)))))))) (. .)))
Organic compounds of the same group are differentiated by the size of the hydrocarbon group (R) they are found on (a hydrocarbon is a compound composed of hydrogen and carbon).
(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))))))) (. .)))