meso structures

Relative configurations of consecutive, but not necessarily contiguous, constitutionally equivalent carbon atoms that have a symmetrically-constituted connecting group (if any) are designated 'meso' or 'racemo', as appropriate. Examples: (The symbol represents a symmetrically-constituted connecting group, such as –CH₂–, –CH₂–CH₂–, or –CR₂–CH₂–CR₂–.)