Product name:Letrozole Synonyms:4,4’-(1h-1,2,4-Triazol-1-Ylmethylene)Bisbenzonitrile; Lelrozol; 4,4’-(1h-1,2,4-Triazol-1-Ylmethylene) Bis-Benzonitrile; Femara; Letrozol; Letrazole CAS no:112809-51-5 Molecular formula:C17H11N5 Molecular weight:285.31 package:aluminium foil bag for small quantity;drums for commercial quantity