Re: [chem] more on bonds and arrows

Dear Branden, Dear Hans

thank you for your replies.

The examples sent indeed were a demo -- indeed for discussion.  Now that I know
the workflow here, without a GUI (in contrast to GitLab/GitHub), I will turn
in a patch about ATP.chem as attachment to an email by tomorrow.  With Hans'
additions by January, there could be further improvement (more like the
depiction in Wikipedia's [property box], closer to today's standards of
representation).

No, the definition leading to atp-fixed.ps _is not_ correct at the level of the
hexagonal structure.  Here, either one puts the Thiele ring within the
hexagon (can be seen as "old fashion" more frequently seen in the books up to
about 1960s/1970s, [example]), or uses an alternating set of single and double
strokes ; the instruction `benzene` (which already `ring` or `ring6` with this
ring) collides with the later `double 1,2 3,4 5,6`) in the line of 

```
benzene put N at 2 put N at 4 double 1,2 3,4 5,6 \
```


Regards,
Norwid

[property box]: https://en.wikipedia.org/wiki/Adenosine_triphosphate
[example]:
https://chemistry.stackexchange.com/questions/171176/what-compound-was-drawn-on-this-sidewalk/171183#171183

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