Repeating units with repetition ranges - Frequency variation

A sequence of ranges to specify the repetition can also be used in a special group called repeating unit with repetition ranges.

For example:
images/download/attachments/45978767/markush2.png

Here the repetition range is "3,5-7". The repetition count for the included structure can be: 3,5,6 or 7.

Syntax of the repetition ranges

The repetition ranges consist of ranges and/or numbers separated by commas. E.g 3, 5-7

To draw a repeating unit with repetition ranges

  1. Draw the structure.

  2. Click the Group tool on the toolbar, and select the structure to be included in the range.

  3. In the "Create Group" dialog window choose the type "Repeating unit with repetition ranges" from the "Type" list.

  4. Set the repetition ranges.

  5. Click OK.