摘要:
Compounds of formula (I): ##STR1## wherein R is a polyfluoroalkoxy or polyfluoroalkyl radical and R.sub.1 is a hydrogen atom and R.sub.2 is a hydroxyl radical, or R.sub.1 is a hydroxyl radical and R.sub.2 is a hydrogen atom, salts thereof, the preparation of said compounds, and drugs containing same.