( ( Constitutional isomers ) ( ( have ( different ( atomic connectivities ) ) ) . ) )
(ROOT (S (NP (NNP Constitutional) (NNS isomers)) (VP (VBP have) (NP (JJ different) (JJ atomic) (NNS connectivities))) (. .)))
Constitutional isomers have different atomic connectivities.
(ROOT (S (NP (NP (NNS Alkenes)) (PP (IN with) (NP (NP (DT the) (JJ same) (NNS atoms)) (PP (CC but) (NP (JJ different) (NNS shapes)))))) (VP (VBP are) (VP (VBN called) (NP (NNS isomers)))) (. .)))