( ( OZONE Ozone ) ( ( is ( ( a gas ) ( of ( oxygen ( ( an ( oxygen molecule ) ) ( ( ( containing ( ( three atoms ) ( instead ( of two ) ) ) ) , ) ( like ( ( the oxygen ) ( we breathe ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP OZONE) (NNP Ozone)) (VP (VBZ is) (NP (NP (DT a) (NN gas)) (PP (IN of) (S (VP (VBG oxygen) (NP (NP (DT an) (NN oxygen) (NN molecule)) (VP (VBG containing) (NP (NP (CD three) (NNS atoms)) (PP (RB instead) (IN of) (NP (CD two)))) (, ,) (PP (IN like) (NP (NP (DT the) (NN oxygen)) (SBAR (S (NP (PRP we)) (VP (VB breathe))))))))))))) (. .)))
OZONE Ozone is a gas of oxygen an oxygen molecule containing three atoms instead of two, like the oxygen we breathe.
(ROOT (S (NP (CD Three) (NN oxygen) (NNS ions)) (VP (VBP make) (PRT (RP up)) (NP (DT an) (NN ozone) (NN molecule))) (. .)))