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Branched structures are slightly more difficult to enter but are not too hard if you remember the basic rule
Enter a branch completely before starting the next branch.
For example, to enter 4-methyl-2-heptene
enter the structure up to the green elements, then choose one of the branches to enter - we have chosen the red branch. One that branch is complete, we enter the blue branch.
Quite complicated structures can be entered in this way - citric acid for example.