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Antiestrogen Steroids

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CAS: 107868-30-4
Molecular formula: C20H24O2
Molecular weight:296.4
Grade : Pharmaceutical Grade
Storage: Shading, confined preservation

Exemestane (trade name Aromasin) is a drug used to treat breast cancer. It is a member of the class of drugs known asaromatase inhibitors. Some breast cancers require estrogen to grow. Those cancers have estrogen receptors (ERs), and are called ER-positive.They may also be called estrogen-responsive, hormonally-responsive,or hormone-receptorpositive.Aromatase is an enzyme that synthesizes estrogen. Aromatase inhibitors block the synthesis of estrogen. This lowers the estrogen level, and slows the growth of cancers.

Exemestane is an oral steroidal aromatase inhibitor that is used in ER-positive breast cancer in addition to surgery and/or radiation in post-menopausal women.Aromasin is used to fight breast cancer and raise testosterone in the body.Exemestane blocks the process of aromatisation. So it lowers the amount of oestrogen in the body. In early breast cancer, taking exemestane can help to stop breast cancer coming back. In advanced breast cancer the cancer cells may grow more slowly or stop growing completely.

Exemestane is an aromatase inhibitor. This means it blocks the enzyme aromatase (found in the body's muscle, skin, breast and fat), which is used to convert androgens (hormones produced by the adrenal glands) into estrogen. In the absence of estrogen, tumors dependent on this hormone for growth will shrink.

Exemestane carries the ability to inhibit the aromatase enzyme, which is responsible for the production or conversion of testosterone to estrogen. Aromasin has the ability to block aromatization, which in turn inhibits the production of estrogen, and thereby lowers the body’s serum estrogen levels.

TEST ITEMS SPECIFICATION RESULTS
Description White Crystalline Powder White Powder
Identification Positive Positive
Assay(by HPLC) 98.0~102.0% 99.64%
Absorbance(E1cm) 465~495 482.5
Melting Point 191~195℃ 193.5~195.0℃
Loss On Drying 0.5%max 0.19%
Specific Rotation +288°~ +298° +290.2°
Residue On Ignition 0.1%max 0.03%
Related Substances Total:1.5%max <1.3%
Residue Solvents 0.2%max 0.10%
Heavy Metals 20PPm max <10PPm
Conclusion The specification conform with USP35

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