Patent Document ID: 4062840
Application ID: 05651760
Patent Flag: 1

Claim One:
1. A compound of the formula: ##STR18## or a pharmaceutically acceptable salt thereof, in which R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are selected from the group consisting of hydrogen, hydroxy, halogen, alkyl having 1 to 6 carbon atoms, alkoxy having 1 to 6 carbon atoms, alkylthio having 1 to 6 carbon atoms and trifluoromethyl, R.sub.5, r.sub.6 are selected from the group consisting of hydrogen, alkyl having 1 to 6 carbon atoms, aralkyl having 7 to 10 carbon atoms, R.sub.7 is selected from the group consisting of hydrogen and alkyl having 1 to 4 carbon atoms, n is selected from 0, 1 and 2, and the dotted line signifies an optional bond.