While I would like to say I remember this from Chemistry class, I believe
my first memory of this is from an episode of Breaking Bad.

On Thu, Jun 30, 2022 at 3:27 PM Chuck McCown via AF <af@af.afmug.com> wrote:

> *Cis* and *trans* isomers <https://en.wikipedia.org/wiki/Isomers> occur
> both in organic molecules and in inorganic coordination complexes. *Cis*
> and *trans* descriptors
> <https://en.wikipedia.org/wiki/Descriptor_(Chemistry)> are not used for
> cases of conformational isomerism
> <https://en.wikipedia.org/wiki/Conformational_isomerism> where the two
> geometric forms easily interconvert, such as most open-chain single-bonded
> structures; instead, the terms "*syn*" and "*anti*" are used.
>
> I am a conformational isomer.
> You may call my syn or sir.
> I call my dad’s sister anti.
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