( ( ( The ( chemical formula ) ) ( for ( carbon dioxide ) ) ) ( ( is ( written ( CO 2 ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ chemical) (NN formula)) (PP (IN for) (NP (NN carbon) (NN dioxide)))) (VP (VBZ is) (VP (VBN written) (NP (NNP CO) (CD 2)))) (. .)))
The chemical formula for carbon dioxide is written CO 2 .
(ROOT (S (NP (NNP Co) (CD 2)) (VP (VBZ is) (NP (NP (DT the) (JJ molecular) (NN formula)) (PP (IN of) (NP (NN carbon) (NN dioxide))))) (. .)))