chemistry

Quinestrol

Quinestrol is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Quinestrol rather than just read about it. In short: Quinestrol, also known as ethinylestradiol cyclopentyl ether (EECPE), sold under the brand name Estrovis among others, is an estrogen medication which has been used in menopausal hormone therapy, hormonal birth control, and to treat breast cancer and prostate cancer. It is taken once per week to once per month by mouth.

Key takeaways

Quinestrol belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Quinestrol to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Quinestrol from memory before moving on to harder problems.

Reference excerpt

Quinestrol, also known as ethinylestradiol cyclopentyl ether (EECPE), sold under the brand name Estrovis among others, is an estrogen medication which has been used in menopausal hormone therapy, hormonal birth control, and to treat breast cancer and prostate cancer. It is taken once per week to once per month by mouth.

Medical uses Quinestrol has been used as the estrogen component in menopausal hormone therapy and in combined hormonal birth control. It has also occasionally been used in the treatment of breast cancer and prostate cancer, as well as to suppress lactation. On its own as an estrogen, quinestrol was taken once per week by mouth. As a combined birth control pill, it was used together with quingestanol acetate and was taken once per month by mouth.

Pharmacology

Quinestrol is a prodrug of ethinylestradiol (EE), with no estrogenic activity of its own. It is taken orally and has prolonged activity following a single dose, with a very long biological half-life of more than 120 hours (5 days) due to enhanced lipophilicity and storage in fat. Because of its much longer half-life, quinestrol is two to three times as potent as EE. Also because of its long half-life, quinestrol can be taken once a week or once a month. Following administration, quinestrol is absorbed via the lymphatic system, is stored in adipose tissue, and is gradually released from adipose tissue.

Chemistry

Quinestrol, also known as ethinylestradiol 3-cyclopentyl ether (EE2CPE), is a synthetic estrane steroid and a derivative of estradiol. It is an estrogen ether, specifically the C3 cyclopentyl ether of ethinylestradiol (17α-ethynylestradiol). Closely related estrogens include mestranol (ethinylestradiol 3-methyl ether) and ethinylestradiol sulfonate (EES; Turisteron; ethinylestradiol 3-isopropylsulfonate).

History Quinestrol was developed and introduced for medical use in the 1960s.

Society and culture

Generic names Quinestrol is the generic name of the drug and its INNTooltip International Nonproprietary Name, USANTooltip United States Adopted Name, and BANTooltip British Approved Name. It is also known by its former developmental code name W-3566.

Brand names Quinestrol has been marketed under brand names including Agalacto-Quilea, Basaquines, Eston, Estrovis, Estrovister, Plestrovis, Qui-Lea, Soluna, and Yueketing, among others.

Availability Quinestrol was marketed as Estrovis in the United States by Parke-Davis and as Qui-Lea in Argentina, but is reportedly not currently marketed. However, it does appear to still be available as an oral contraceptive in combination with progestins in Argentina and China. One tablet form available in China consists of 6 mg levonorgestrel and 3 mg quinestrol; it is used as a prescription "long-term" oral contraceptive, with one dose taken each month. It is sold under various brand names including Yuèkětíng (Chinese: 悦可婷) and Àiyuè (Chinese: 艾悦). A version with the racemic norgestrel in place of levonorgestrel also appears to be available.

Veterinary use

Rodents The Chinese levonorgestrel/quinestrol 2:1 formula is known as EP-1 in veterinary practice. It is known to have some organ-specific effects on the Mongolian gerbil as measured by receptor mRNA expression. Incorporated into baits at a concentration of 50 ppm, EP-1 has been used to control wild Mongolian gerbil populations with some success.

References

Illustrations

Worked examples

Example 1 — a first encounter with Quinestrol

Start with the simplest possible case. Write down what Quinestrol claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Quinestrol before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Quinestrol ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Quinestrol

In research: Quinestrol appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Quinestrol in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Quinestrol is common in secondary-school and first-year university syllabi. It links to neighbouring topics Antigonadotropins, Cyclopentyl ethers, Drugs not assigned an ATC code, so understanding it makes those chapters shorter.
In everyday life: Look for Quinestrol outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Quinestrol in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Quinestrol means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Quinestrol out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Quinestrol in simple terms?

Why does Quinestrol matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Quinestrol?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Quinestrol.