Aromasin

Exemestane (trade name Aromasin) is an oral steroidal aromatase inhibitor (but also known uniquely as an aromatase inactivator) used in the adjuvant treatment of hormonally-responsive (also called hormone-receptor-positive, estrogen-responsive) breast cancer in postmenopausal women. An aim in the treatment of hormone-receptor-positive patients in preventing recurrence is to lower estrogen levels that this breast cancer thrives on.
See more at Wikipedia.org...

Exemestane /exe·mes·tane/ an aromatase inactivator related to androstenedione ; used as an antineoplastic. [more]Aromasin - Community and Resources