Patent ID: 7371759

Claim:
A compound of the formula wherein X is N; R 1 and R 2 are the same or different and are independently selected from H, alkyl, alkoxyalkyl, arylalkyl, cycloalkyl, alkenyl, cycloalkenyl, aryl, heteroaryl or cycloheteroalkyl; R 3 is aryl, heteroaryl, cycloalkyl or cycloheteroalkyl; R 4 is H, alkyl, cycloalkyl, haloalkyl, alkoxyalkyl, alkylthioalkyl, alkylsulfonyl, arylsulfonyl, alkoxycarbonyl, aryloxycarbonyl, heteroaryloxycarbonyl, alkylaminocarbonyl, arylaminocarbonyl, alkylthiocarbonyl, heteroarylaminocarbonyl, alkylaminosulfonyl, alkylcarbonyl, arylcarbonyl, heteroarylcarbonyl or heteroarylsulfonyl; R 6 is H, or lower alkyl, a metal salt, methylamine salt, ammonium salt or dicyclohexylamine salt; R 7 is H or lower alkyl; and represents a single bond or a double bond (which may be cis or trans); or a pharmaceutically acceptable salt thereof where R 6 is H and all stereoisomers thereof.