( ( ( The molecules ) ( of ( a ( saturated ( organic compound ) ) ) ) ) ( ( contain ( only ( single ( carbon-carbon bonds ) ) ) ) ; ) )
(ROOT (S (NP (NP (DT The) (NNS molecules)) (PP (IN of) (NP (DT a) (JJ saturated) (JJ organic) (NN compound)))) (VP (VBP contain) (NP (RB only) (JJ single) (NN carbon-carbon) (NNS bonds))) (: ;)))
The molecules of a saturated organic compound contain only single carbon-carbon bonds;
(ROOT (S (NP (VBG Living) (NNS organisms)) (VP (VBP are) (VP (VBN comprised) (PP (IN of) (NP (NP (JJ organic) (NNS compounds)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (NP (NP (NNS molecules)) (VP (VBN built) (PP (IN around) (NP (NN carbon)))))))))))) (. .)))