Arimidex Powder Raws Anastrozole Best Aromatase Inhibitor AI to Reduce Steroids User Side Effects Gyno Arimidex Anastrozole Chemical Data: CAS Number: 120511-73-1 Molecular Formula: C17H19N5 Molecular Weight: 293.37 Appearance: White crystalline powder.   What is Arimidex (Anastrozole) ? Anastrozole is an extremely powerful anti-estrogen officially belonging to the Aromatase Inhibitor (AI) family. Developed in the early 1990’s by Zenaca Pharmaceuticals and released in …