( ( Compositions ( which ( contain ( ( a compound ) ( of ( indeterminate structure ) ) ) ) ) ) ( , ( ( prepared ( by ( ( the reaction ) ( of ( ( a compound ) ( of ( ( known structure ) ( having ( ( a ( heterocyclic ring ) ) ( ( whose members ) ( are ( ( ( carbon and ) ( at least ) ) ( ( ( ( ( one ( hetero atom ) ) ( selected ( from ( ( nitrogen and ) chalcogen ) ) ) ) -LRB- ) ( i.e. ( , ( oxygen ( , ( sulfur ( , ( selenium ( , ( or tellurium ) ) ) ) ) ) ) ) ) ) -RRB- ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (NNS Compositions)) (SBAR (WHNP (WDT which)) (S (VP (VBP contain) (NP (NP (DT a) (NN compound)) (PP (IN of) (NP (JJ indeterminate) (NN structure)))))))) (, ,) (VP (VBN prepared) (PP (IN by) (NP (NP (DT the) (NN reaction)) (PP (IN of) (NP (NP (DT a) (NN compound)) (PP (IN of) (NP (NP (VBN known) (NN structure)) (VP (VBG having) (NP (NP (DT a) (JJ heterocyclic) (NN ring)) (SBAR (WHNP (WP$ whose) (NNS members)) (S (VP (VBP are) (NP (NP (NN carbon)) (CC and) (ADVP (IN at) (JJS least)) (NP (NP (NP (CD one) (NN hetero) (NN atom)) (VP (VBN selected) (PP (IN from) (NP (NN nitrogen) (CC and) (NN chalcogen))))) (-LRB- -LRB-) (NP (CD i.e.) (, ,) (NN oxygen) (, ,) (NN sulfur) (, ,) (NN selenium) (, ,) (CC or) (NN tellurium)) (-RRB- -RRB-))))))))))))))) (. .)))
Compositions which contain a compound of indeterminate structure, prepared by the reaction of a compound of known structure having a heterocyclic ring whose members are carbon and at least one hetero atom selected from nitrogen and chalcogen (i.e., oxygen, sulfur, selenium, or tellurium).
(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))))))) (. .)))