( ( ( Carbon dioxide ) ( -LRB- ( ( CO 2 ) -RRB- ) ) ) - )
(ROOT (NP (NP (NNP Carbon) (NN dioxide)) (PRN (-LRB- -LRB-) (NP (QP (CD CO) (CD 2))) (-RRB- -RRB-)) (: -)))
Carbon dioxide (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))))) (. .)))