Link Nodes

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You can specify a variable-length chain or ring by indicating that one of the atoms can be repeated some number of times using link nodes.

Link nodes must have exactly two connecting bonds. The atom label must conform to the following conditions:

• No more than a single element symbol or a generic nickname
• The last part of the label in the form: number hyphen number, with the number and hyphen subscripted
• Parentheses or braces may be used instead of brackets
• Brackets can be omitted if not needed for clarity, for example with O_1-3

To create a link node:

1. Open an atom label text box.

2. Type in the following format:

[CH₂]_4-7