( ( This ( colourless substance ) ) ( ( ( ( is ( ( volatile and ) poisonous ) ) , ) ( with ( ( a ( boiling point ) ) ( of ( ( 23.5 ( °C ( . Isocyanic ) ) ) ( acid ( is ( ( the ( simplest ( stable ( chemical compound ) ) ) ) ( that ( contains ( ( ( carbon ( , ( hydrogen ( , ( nitrogen ( , ( and oxygen ) ) ) ) ) ) ) , ) ( ( the ( four ( ( most ( commonly found ) ) elements ) ) ) ( in ( organic ( ( chemistry and ) biology ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NNS colourless) (NN substance)) (VP (VBZ is) (ADJP (JJ volatile) (CC and) (JJ poisonous)) (, ,) (PP (IN with) (NP (NP (DT a) (JJ boiling) (NN point)) (PP (IN of) (NP (NP (NNP 23.5) (NNP °C) (. .) (NNP Isocyanic)) (SBAR (S (NP (NN acid)) (VP (VBZ is) (NP (NP (DT the) (JJS simplest) (JJ stable) (NN chemical) (NN compound)) (SBAR (WHNP (WDT that)) (S (VP (VBZ contains) (NP (NP (NN carbon) (, ,) (NN hydrogen) (, ,) (NN nitrogen) (, ,) (CC and) (NN oxygen)) (, ,) (NP (NP (DT the) (CD four) (ADJP (RBS most) (RB commonly) (VBN found)) (NNS elements)) (PP (IN in) (NP (JJ organic) (NN chemistry) (CC and) (NN biology))))))))))))))))) (. .)))
This colourless substance is volatile and poisonous, with a boiling point of 23.5 °C. Isocyanic acid is the simplest stable chemical compound that contains carbon, hydrogen, nitrogen, and oxygen, the four most commonly found elements in organic chemistry and biology.
(ROOT (S (NP (NNP Rna) (CC and) (NNP dna)) (VP (VBP are) (NP (NP (NNS types)) (PP (IN of) (NP (NP (JJ nucleic) (NNS acids)) (VP (VBG containing) (NP (NP (DT the) (NNS elements)) (NP (NN carbon) (, ,) (NN hydrogen) (, ,) (NN oxygen) (, ,) (NN nitrogen) (, ,) (CC and) (NN phosphorus)))))))) (. .)))