Chemical formulae are ambiguous so when you enter a structure, there is often more than one valid way of displaying it. How do you tell FX ChemStruct which version you are after.
In FX ChemStruct you can change a structure's "structure" by clicking on the elements.
For example, if you type
ch3chch3ch2chch3ch3
you will see
If you want
You have to have some way of telling FX ChemStruct what you are after. To achieve this new version, you need to click on the CH we have coloured green. As you click on elements, FX ChemStruct will colour the element green so you can track which element you clicked on.
Clicking on an element shuffles the bonds around that element