Letrozole Powder Femara API Aromatase Inhibitor For Sale Letrozole Femara Basic Info: CAS-Nr.: 112809-51-5 M.F.: C17H11N5 M.W.: 285.3 Schmelzpunkt: 181-183 ℃ Appearance: White crystalline powder What is Femara (Letrozol) ? Letrozole is an anti-estrogen of the Aromatase Inhibitor (KI) family and is one of the most potent and powerfully effective of all AI’s. Eigentlich, its potency is sometimes too much …