( Ozone ( ( is ( ( an ( unstable molecule ) ) ( composed ( of ( ( three ( oxygen atoms ) ) ( -LRB- ( O3 -RRB- ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Ozone)) (VP (VBZ is) (NP (NP (DT an) (JJ unstable) (NN molecule)) (VP (VBN composed) (PP (IN of) (NP (NP (CD three) (NN oxygen) (NNS atoms)) (PRN (-LRB- -LRB-) (NP (NNP O3)) (-RRB- -RRB-))))))) (. .)))
Ozone is an unstable molecule composed of three oxygen atoms (O3).
(ROOT (S (NP (CD Three) (NN oxygen) (NNS ions)) (VP (VBP make) (PRT (RP up)) (NP (DT an) (NN ozone) (NN molecule))) (. .)))