( ( Organic compounds ) ( ( are ( carbon-based compounds ) ) . ) )
(ROOT (S (NP (NNP Organic) (NNS compounds)) (VP (VBP are) (NP (JJ carbon-based) (NNS compounds))) (. .)))
Organic compounds are carbon-based compounds.
(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)))))))))))) (. .)))