( ( ( ( The reaction ) ( of ( oxygen atoms ) ) ) ( with hydrocarbons ) ) . )
(ROOT (NP (NP (DT The) (NN reaction)) (PP (IN of) (NP (NN oxygen) (NNS atoms))) (PP (IN with) (NP (NNS hydrocarbons))) (. .)))
The reaction of oxygen atoms with hydrocarbons.
(ROOT (S (NP (DT An) (NN ether)) (VP (VBZ is) (NP (NP (DT an) (JJ organic) (NN compound)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (CD two) (NN hydrocarbon) (NNS groups)) (VP (VBP are) (VP (VBG bonded) (PP (TO to) (NP (DT the) (JJ same) (NN oxygen) (NN atom))))))))) (. .)))