How to hide those C symbols for terminal carbon atoms in SVG with the "babel" command?

If you want to hide those C symbols for terminal carbon atoms in SVG format, you can use the "-o svg -xC" option with the "babel" command.

Here is how the "-xC" option is described in Open Babel help document: "C - do not draw terminal C (and attached H) explicitly The default is to draw all hetero atoms and terminal C explicitly, together with their attached hydrogens."

For example, the following command generate a SVG picture without C symbols for terminal carbon atoms for the aspirin molecule:

fyicenter$ obabel "-:O=C(Oc1ccccc1C(=O)O)C" -O aspirin-no-carbon.svg --gen2D -xC

1 molecule converted

As a comparison, running the following command generates a SVG picture with C symbols for terminal carbon atoms for the same molecule:

fyicenter$ obabel "-:O=C(Oc1ccccc1C(=O)O)C" -O aspirin.svg --gen2D

1 molecule converted

Open both output files, aspirin.svg and aspirin-no-carbon.svg, in a Web browser, you see the differences:

⇒ "babel -i sdf -o svg" - Custom Atom Positions

⇐ "babel ... -o svg -xX" - Hide Implicit H in SVG

⇑ "babel ... -o svg" - Generating SVG Pictures

⇑⇑ Open Babel Tutorials