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There are also over-the-counter potions made with analogues of prostaglandins — often isopropyl cloprostenate, dechloro dihydroxy difluoro ethylcloprostenolamide or methylamido dihydro noralfaprostal on ingredient lists.

The transition between the two classes as differentiated above may be illustrated by the following cyclic compounds, each of which contains a ring composed of four carbon atoms and one oxygen atom: The first four substances are readily formed from, and converted into, the corresponding dihydroxy open-chain compound; these substances are truly aliphatic in character.