( They ( ( ( lack ( a ( hydrogen ( atom bonded ) ) ) ) ( to ( the ( nitrogen atom ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP lack) (NP (DT a) (NN hydrogen) (NN atom) (NN bonded)) (PP (TO to) (NP (DT the) (NN nitrogen) (NN atom)))) (. .)))
They lack a hydrogen atom bonded to the nitrogen atom.
(ROOT (S (NP (NNS Amines)) (VP (VBP are) (VP (VBN classified) (PP (VBG according) (PP (TO to) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NN carbon) (NNS atoms)) (VP (VBG bonded) (ADVP (RB directly)) (PP (TO to) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (JJ nitrogen) (NN atom))))))))))) (. .)))