( Diaziridines ( ( are ( ( heterocyclic compounds ) ( ( containing ( two ( nitrogen atoms ) ) ) ( in ( a ( three-membered ring ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Diaziridines)) (VP (VBP are) (NP (NP (JJ heterocyclic) (NNS compounds)) (VP (VBG containing) (NP (CD two) (NN nitrogen) (NNS atoms)) (PP (IN in) (NP (DT a) (JJ three-membered) (NN ring)))))) (. .)))
Diaziridines are heterocyclic compounds containing two nitrogen atoms in a three-membered ring.
(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))))))) (. .)))