Highlighting Valence Errors highlights atoms having wrong valences with red underline when it is checked.

Automatic Lone Pair Calculation calculates lone pairs automatically. Make sure View > Misc > Lone Pairs is checked to see the result.

Validate S-groups At Creation disables the S-group types in the drop-down list which would not yield a chemically correct structure. For more information on S-groups click here.

Carbon Labels options determine the condition of displaying C labels on Carbon atoms.

Ligand Orders

• Always

• Never

• On R-groups with definitions