Benzo[a]phenothiazines and hydro-derivatives for inhibiting leukotriene biosynthesis
 Pharmaceutical compositions containing a compound of Formula I: ##STR1## wherein X is O, S, SO or SO.sub.2 and R.sub.2, R.sub.3, R.sub.4 and R.sub.5 may be positioned anywhere on the structure, or a pharmaceutically-acceptable salt thereof and certain novel benzo[a]phenothiazines, which compositions and compounds are useful in treating allergic conditions, asthma, cardiovascular disorders, inflammation and pain and are useful as cytoprotective agents. 
Merck Frosst Canada, Inc.
A C C C A
A61K C07D C07F C07D A61K
inventional inventional inventional inventional inventional
Christiane Yvan Cheuk K. Yves Joshua Rejean
Yoakim Guindon Lau Girard Rokach Fortin