Is Ethinylestradiol cyclopentyl ether vegan?

Quinestrol is also known as Ethinylestradiol cyclopentyl ether.

Quinestrol is a synthetic estrogen medication, chemically the cyclopentyl ether of ethinylestradiol, which has been used in menopausal hormone therapy and hormonal contraception. It is taken orally on a weekly to monthly basis.

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