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Clear up ring numbering rule #36

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Clear up ring numbering rule #36

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2 changes: 1 addition & 1 deletion IUPAC_SMILES+.asciidoc
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Expand Up @@ -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)`
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