As an adjective isomeric
is (chemistry|physics) being an isomer.
As a noun butylene is
(organic compound) any of three isomeric aliphatic alkenes containing four carbon atoms and one double bond; their polymers are used as synthetic rubber.
isomeric
English
Adjective
(-)
(chemistry, physics) Being an isomer.
(chemistry) Exhibiting isomerism.
butylene
English
Noun
(
en noun)
(organic compound) Any of three isomeric aliphatic alkenes containing four carbon atoms and one double bond; their polymers are used as synthetic rubber.