( ( Fission ( of ( the ring ) ) ) ( ( can ( ( ( take place ) ( either ( ( ( between ( ( two ( adjacent ( hydroxyl groups ) ) ) ( -LRB- ( ortho-fission -RRB- ) ) ) ) or ) ( adjacent ( to ( a ( hydroxyl group ) ) ) ) ) ) ) ( -LRB- ( meta-fission -RRB- ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Fission)) (PP (IN of) (NP (DT the) (NN ring)))) (VP (MD can) (VP (VB take) (NP (NN place)) (PP (CC either) (PP (IN between) (NP (NP (CD two) (JJ adjacent) (JJ hydroxyl) (NNS groups)) (PRN (-LRB- -LRB-) (NP (NN ortho-fission)) (-RRB- -RRB-)))) (CC or) (PP (ADVP (JJ adjacent)) (TO to) (NP (DT a) (JJ hydroxyl) (NN group)))) (PRN (-LRB- -LRB-) (ADJP (JJ meta-fission)) (-RRB- -RRB-)))) (. .)))
Fission of the ring can take place either between two adjacent hydroxyl groups (ortho-fission) or adjacent to a hydroxyl group (meta-fission).
(ROOT (S (NP (NNP Fission)) (VP (VBZ takes) (NP (NP (NN place)) (SBAR (WHADVP (WRB when)) (S (NP (DT an) (NN animal)) (ADVP (RB simply)) (VP (VBZ divides) (PP (IN into) (NP (CD two) (NNS parts)))))))) (. .)))