What are the rules for writing condensed structural formulas?
Condensed structural formulas are designed to be typed on a single line. Here are the rules.
- Write the atoms of the longest chain horizontally in the order in which they are connected.
- You may combine repeating horizontal units in subscripted parentheses.
- Write all of the ligands on an atom immediately to its right, with subscripts for multiples.
- Exception: Write ligands on the leftmost atom immediately to its left.
- Enclose polyatomic ligands in parentheses.
- Use explicit bonds as needed to clarify attachments.
- It is preferable to treat equivalent groups equally.
Here are some examples of condensed structural formulas.