Structural modification of [2-(2-benzhydryloxyiminopentyl)- 1,2,3,4-te
trahydro-5-naphthyloxy]acetic acid (4), previously identifed as a PGI(
2) agonist without a PG skeleton, was examined. Conversion of the oxim
e moiety in 4 to the pyrazole led to yl)methyl-1,2,3,4-tetrahydro-5-na
phthyl-oxy]acetic acid (34) which strongly inhibited ADP-induced aggre
gation human platelets in vitro.