“…11-Dehydroprogesterone (CIV) produced the Corner-Alien reaction with 2 mg. or less. 17(a)-Hydroxyprogesterone (CV), originally thought to possess the /3-configuration, was isolated from adrenal extracts by Pfiffner and North (31,32) and later also by von Euw and Reichstein (46). It possesses no progestational activity.…”