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Table 4 Different classes of aromatase inhibitors:

From: The role of aromatase inhibitors in ameliorating deleterious effects of ovarian stimulation on outcome of infertility treatment

Generation Non-Steroidal Steroidal
First Generation Aminogltethimide  
Second Generation Rogletimide Formestane
  Fadrozole  
Third Generation Anastrozole Exemestane
  Letrozole  
  Vorozole