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The italic word meso before a compound's name.
Also known as: Meso compound prefix, Meso form, Internally compensated isomer
A meso compound has stereocentres and is nonetheless achiral, because an internal mirror plane makes one half the reflection of the other. It is the standing counter-example to the rule that stereocentres imply chirality.
Denotes an achiral stereoisomer that contains stereocentres, made achiral by an internal mirror plane.
Contexts: Laboratory
Is the standard counter-example to the assumption that a molecule with stereocentres must be chiral.
Contexts: Laboratory
Is optically inactive as a pure substance, unlike a racemate, which is inactive only because it is a mixture.
Contexts: Laboratory
The four italic letters m, e, s and o followed by a hyphen, set before a compound's name.