( Subject ( ( matter ( wherein ( ( the ( specified ( nitrogen-containing material ) ) ) ( ( contains ( ( ( at least ) one ) ( nitrogen atom ) ) ) ( as ( ( a ( ring member ) ) ( of ( a ( heterocyclic compound ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Subject)) (VP (NN matter) (SBAR (WHADVP (WRB wherein)) (S (NP (DT the) (VBN specified) (JJ nitrogen-containing) (NN material)) (VP (VBZ contains) (NP (QP (IN at) (JJS least) (CD one)) (NN nitrogen) (NN atom)) (PP (IN as) (NP (NP (DT a) (NN ring) (NN member)) (PP (IN of) (NP (DT a) (JJ heterocyclic) (NN compound))))))))) (. .)))
Subject matter wherein the specified nitrogen-containing material contains at least one nitrogen atom as a ring member of a heterocyclic compound.
(ROOT (S (NP (DT A) (JJ heterocyclic) (NN compound)) (VP (VBZ contains) (NP (NP (NNS atoms)) (PP (IN of) (NP (NP (QP (CD two) (CC or) (JJR more)) (JJ different) (NNS elements)) (PP (IN in) (NP (PRP$ its) (NN ring) (NN structure))))))) (. .)))