or a pharmaceutically acceptable salt thereof
wherein:
X is O or S,
R is selected from the group consisting of1
(a) S(O) CH ,
2 3
(b) S(O) NH ,
2 2
(c) S(O) NHCOCF ,
2 3
(d) S(O)(NH)CH ,
3
(e) S(O)(NH)NH ,
2
(f) S(0)(NH)NHCOCF3,
(g) P(O)(CH )OH, and
3
(h) P(O)(CH )NH ,
3 2
R is selected from the group consisting of2
(a) C alkyl,
1-6
(b) C cycloalkyl,
3-7
(c) mono- or di-substituted phenyl or
napthyl wherein the substituent is selected from the
group consisting of
(1) hydrogen,
(2) halo, including F, Cl, Br, I,
(3) C alkoxy,
1-6
(4) C alkylthio,
1-6
6
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Last modified: November 3, 2007