Which compounds (I-IV) form a set of stereoisomers? 
Definitions:
-Ectasis
A suffix indicating dilation or expansion of a hollow organ or vessel.
Cardiotonic
A substance that increases the contractility of the heart muscle, improving its performance.
Vasodilator
A substance that causes blood vessels to expand, increasing blood flow; used in the treatment of conditions like hypertension.
Vasopressor
A type of medication that causes blood vessels to narrow, raising blood pressure.
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