Complex sentence: In fact atoms two and four are exactly equivalent-imagine turning the molecule around by 180 degrees, and you will see that this is the case-it just depends on which end you choose to start numbering the carbons.
Split into simpler sentences: In fact atoms two and four are exactly equivalent-imagine turning the molecule around by 180 degrees, and you will see that this is the case. It just depends on which end you choose to start numbering the carbons.