Appeal No. 1997-2167
Application 08/137,444
appellants' invention.
Claim 1. A compound of the formula
wherein
R is hydrogen, (C -C )alkylcarbonyl,1 1 I2
(C -C )alkoxycarbonyl, aryl(C -C )alkylaminocarbonyl,1 I2 1 I2
mono(C -C )alkylaminocarbonyl or
1 18
di(C -C )alkylaminocarbonyl;
1 18
R is (C -C )alkylcarbonyloxy,2 1 I2
aryl(C C )alkylcarbonyloxy, (C -C )alkoxycarbonyloxy,l-4 1 12
arylcarbonyloxy, hydroxy,
(C -C )alkoxycarbonyl(C -C )alkoxy or
1 6 1 6
hydroxy(C -C )alkoxy;
l 10
R is hydrogen or halo; and pharmaceutically3
acce ptable
addi tion salts;
with the proviso
that when R is2
hydr oxy, R and1
R3 are not
both hydrogen or
when R is2
hydr oxy and R3
is hydrogen, R1
3
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