( ( In addition ) ( , ( ( quantum ( mechanics methods ) ) ( ( are ( required ( to ( accurately ( describe ( ( transition ( states ( and ( chemical reactions ) ) ) ) ( involving ( bond ( ( breaking and ) formation ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NN addition))) (, ,) (NP (NN quantum) (NNS mechanics) (NNS methods)) (VP (VBP are) (VP (VBN required) (S (VP (TO to) (VP (ADVP (RB accurately)) (VB describe) (NP (NP (NN transition) (NNS states) (CC and) (NN chemical) (NNS reactions)) (PP (VBG involving) (NP (NN bond) (NN breaking) (CC and) (NN formation))))))))) (. .)))
In addition, quantum mechanics methods are required to accurately describe transition states and chemical reactions involving bond breaking and formation.
(ROOT (S (NP (JJ Catabolic) (NNS reactions)) (VP (VBP involve) (S (VP (VBG breaking) (NP (NNS bonds))))) (. .)))