From eee685b95d03544ec1b2da76e56b64b4fea83e7c Mon Sep 17 00:00:00 2001 From: vaitkus Date: Wed, 12 Feb 2025 15:40:02 +0200 Subject: [PATCH] Clear up ring numbering rule. --- IUPAC_SMILES+.asciidoc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/IUPAC_SMILES+.asciidoc b/IUPAC_SMILES+.asciidoc index f6aaf6e..10a93c0 100644 --- a/IUPAC_SMILES+.asciidoc +++ b/IUPAC_SMILES+.asciidoc @@ -581,7 +581,7 @@ has been encountered twice, that number is available again for subsequent ring c Two-digit ring numbers are permitted, but must be preceded by the percent `'%'` symbol, such as `C%25CCCCC%25` for cyclohexane. -Three digit ring numbers must use parentheses, `%(nnn)`, and start with `100`. This is to avoid +Three digit ring numbers must use parentheses, `%(nnn)`, and start at `100`. This is to avoid the ambiguity of, for example `C%123` being interpreted as one ring closure (`%123`) or two (`%12` and `3`). When parentheses are used, the ring closure is interpreted with one rnum specification, so cyclohexane can be represented as `C%(123)CCCCC%(123)`