gbranden pushed a commit to branch master
in repository groff.
commit a149c1b0f4950b402e7782f130003774d31ef5ed
Author: Norwid Behrnd <[email protected]>
AuthorDate: Mon Jan 19 18:12:44 2026 -0600
[chem]: Fix Savannah #67922 (2/3).
* contrib/chem/examples/mepacrine.chem: Update to describe mepacrine.
Now the visual representation of the structure matches the
expectations set by the file name. The visuals obtained by a
compilation meet the rules compiled by Brecher.[1]
[1] Brecher, J. Graphical Representation Standards for Chemical
Structure Diagrams (IUPAC Recommendations 2008). Pure Appl. Chem
2008, 80 (2), 277–410. https://doi.org/10.1351/pac200880020277.
Continues fixing <https://savannah.gnu.org/bugs/?67922>.
---
contrib/chem/ChangeLog | 14 +++++++++++
contrib/chem/examples/mepacrine.chem | 45 ++++++++++++++++++++----------------
2 files changed, 39 insertions(+), 20 deletions(-)
diff --git a/contrib/chem/ChangeLog b/contrib/chem/ChangeLog
index 836ea9412..5eeb1d598 100644
--- a/contrib/chem/ChangeLog
+++ b/contrib/chem/ChangeLog
@@ -1,3 +1,17 @@
+2026-01-18 Norwid Behrnd <[email protected]>
+
+ * examples/mepacrine.chem: Update to describe mepacrine. Now
+ the visual representation of the structure matches the
+ expectations set by the file name. The visuals obtained by a
+ compilation meet the rules compiled by Brecher.[1]
+
+ [1] Brecher, J. Graphical Representation Standards for Chemical
+ Structure Diagrams (IUPAC Recommendations 2008). Pure Appl.
+ Chem 2008, 80 (2), 277–410.
+ https://doi.org/10.1351/pac200880020277.
+
+ Continues fixing <https://savannah.gnu.org/bugs/?67922>.
+
2026-01-18 Norwid Behrnd <[email protected]>
* examples/morphine.chem: Rename this...
diff --git a/contrib/chem/examples/mepacrine.chem
b/contrib/chem/examples/mepacrine.chem
index 52e92fd03..611b88aca 100644
--- a/contrib/chem/examples/mepacrine.chem
+++ b/contrib/chem/examples/mepacrine.chem
@@ -1,31 +1,36 @@
-morphine.chem:
+mepacrine.chem:
.cstart
# Example file for chem:
-# Morphine or C23_H31_N3O or
-# N,N-diethyl-N'-(2-methoxyacridin-9-yl)-pentane-1,4-diamine
+# mepacrine or atabrine or quinacrine or C_23H30_ClN_3O (CAS-RN: 83-89-6)
#
-# Found at http://www.chemindustry.com/apps/chemicals.
+# Found at https://en.wikipedia.org/wiki/Mepacrine
#
-# Prepared by Bernd Warken <[email protected]>.
+# Prepared by Bernd Warken <[email protected]>,
+# reorganized by Norwid Behrnd <[email protected]>.
+
+R1: ring6 double 1,2 3,4 5,6
+R2: ring6 with .V5 at R1.V3 put N at 4 double 1,2 3,4
+R3: ring6 with .V5 at R2.V3 double 1,2 3,4
+
+ bond -120 at R1.V5 ; Cl
-R1: benzene
-R2: benzene with .V6 at R1.V2 with .V5 at R1.V3 put N at 4
-R3: benzene with .V6 at R2.V2 with .V5 at R2.V3
- bond 60 at R3.V2 ; O
- bond 120
bond up at R2.V1 ; N
- bond 60 ; H
- bond -60 at N
-B1: backbond -120
- bond up at B1.start
- bond -60
- bond up
- bond -60 ; N
+ H left of N
+ bond 60 from N
+BP: bond 120
+ bond up from BP.start
+ bond 120 from BP.start
+ bond 60
+ bond 120
+ bond 60 ; N
bond up
- bond -60
- bond -120 at N
- bond -60
+ bond 60
+ bond 120 from N
+ bond 60
+
+ bond 60 at R3.V2 ; O
+ bond 120
# Local Variables:
# mode: Nroff
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