( ( The ( chain ( scission reaction ) ) ) ( ( involves ( ( ( the breaking ) ( of one ) ) ( of ( ( ( the ( oxygen bonds ) ) ( between ( the ( glucose units ) ) ) ) ( -LRB- ( ( ( the ( building blocks ) ) ( of cellulose ) ) -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN chain) (NN scission) (NN reaction)) (VP (VBZ involves) (NP (NP (DT the) (NN breaking)) (PP (IN of) (NP (CD one))) (PP (IN of) (NP (NP (DT the) (NN oxygen) (NNS bonds)) (PP (IN between) (NP (DT the) (NN glucose) (NNS units))) (PRN (-LRB- -LRB-) (NP (NP (DT the) (VBG building) (NNS blocks)) (PP (IN of) (NP (NN cellulose)))) (-RRB- -RRB-)))))) (. .)))
The chain scission reaction involves the breaking of one of the oxygen bonds between the glucose units (the building blocks of cellulose).
(ROOT (S (NP (JJ Catabolic) (NNS reactions)) (VP (VBP involve) (S (VP (VBG breaking) (NP (NNS bonds))))) (. .)))