While testing 2D to 3D conversion with random drawn structures, I've noticed 
that Jmol 
sometimes fails to calculate a hydrogen for a carbon that has 3 substituents.
Today an example has shown this dramatically.

I am using  "minimize addHydrogens" or just "calculate hydrogens" with same 
result. Tested 
now on 12.1.13 and 12.1.21, probably also other versions.

The data is loaded into Jmol unsigned applet as text in 2D MOL format using 
loadinline, but 
I've just verified that saving to a file and loading it into Jmol app does the 
same.

Example (also attached):
------------------

  Ketcher 11141015152D 1   1.00000     0.00000     0

 14 15  0     0  0            999 V2000
   -1.1250    0.2250    0.0000 C   0  0  0  0  0  0  0        0  0  0
   -0.2340   -0.2750    0.0000 C   0  0  0  0  0  0  0        0  0  0
   -0.2340   -1.2750    0.0000 C   0  0  0  0  0  0  0        0  0  0
   -1.1250   -1.7750    0.0000 C   0  0  0  0  0  0  0        0  0  0
   -1.9910   -1.2750    0.0000 C   0  0  0  0  0  0  0        0  0  0
   -1.9910   -0.2750    0.0000 C   0  0  0  0  0  0  0        0  0  0
    0.7171    0.0340    0.0000 C   0  0  0  0  0  0  0        0  0  0
    1.3049   -0.7750    0.0000 C   0  0  0  0  0  0  0        0  0  0
    0.7171   -1.5840    0.0000 C   0  0  0  0  0  0  0        0  0  0
   -1.1311    1.2250    0.0000 C   0  0  0  0  0  0  0        0  0  0
   -0.2682    1.7303    0.0000 C   0  0  0  0  0  0  0        0  0  0
   -2.0002    1.7197    0.0000 C   0  0  0  0  0  0  0        0  0  0
    1.0261    0.9851    0.0000 N   0  0  0  0  0  0  0        0  0  0
    2.3049   -0.7750    0.0000 O   0  0  0  0  0  0  0        0  0  0
  1  2  1  0     0  0
  2  3  1  0     0  0
  3  4  1  0     0  0
  4  5  1  0     0  0
  5  6  1  0     0  0
  6  1  1  0     0  0
  2  7  1  0     0  0
  7  8  1  0     0  0
  8  9  1  0     0  0
  9  3  1  0     0  0
  1 10  1  0     0  0
 10 11  1  0     0  0
 10 12  1  0     0  0
  7 13  1  1     0  0
  8 14  1  1     0  0
M  END
------------------

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   ---- File information -----------
     File:  sample1.mol
     Date:  14 Nov 2010, 15:16
     Size:  1446 bytes.
     Type:  Unknown

Attachment: sample1.mol
Description: Binary data

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