Xiang, I would suggest that whatever software you use to produce the ALC files 
is changed 
so that it produces MOL files. These have a well documented format 
specification and will 
be read by Jmol as well as RasMol.
It seems that Alchemy format is rather old (there isn't even a mention of the 
program at the 
Tripos website) and there is no documentation about the format details, so it 
is difficult and 
unlikely that Jmol will read it.


> *   Firstly, I adopted the alchemy format in 3DNA primarily because it is one 
> of the formats 
>     supported by RasMol. PDB format is also used in 3DNA for atomic 
> representations, and 
>     the alchemy format is simpler for schematics by specifying each 
> node/linkage explicitly.

MDL MOL format specifies atoms and bonds as well, and you can easily instruct 
Jmol to 
render those bonds only. I guess you could even use plain text files making use 
of the 
DATA command in Jmol to draw the boxes you need.


> *   As I mentioned in my previous message, I am "playing tricks" with the 
> alchemy format 

Yes, that was clear. But the brief answer is: Jmol does not understand the alc 
format.


> In relation to Jmol, I am hoping Jmol could render such "non-chemistry-based" 
> alchemy file 
> properly. In essence, the render just needs to respect the node and linkage 
> information explicitly 
> defined in the file: it does not try to be "clever" to deduce some chemistry 
> from it.

Yes, that is perfectly possible. But you need a file format that Jmol 
understands.

Maybe you can use some utility like OpenBabel to convert ALC to MDL files?
or http://www.webqc.org/molecularformatsconverter.php



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