Letrozole Powder Femara API Aromatase Inhibitor For Sale Letrozole Femara Basic Info: Nº CAS: 112809-51-5 MF: C17H11N5 M.W.: 285.3 Ponto de fusão: 181-183 ℃ Appearance: White crystalline powder What is Femara (Letrozol) ? Letrozole is an anti-estrogen of the Aromatase Inhibitor (IA) family and is one of the most potent and powerfully effective of all AI’s. Na verdade, its potency is sometimes too much …