S 145 [ 5,7-(3-phenylsulfonylamino(2.2.1)bicyclohept-2-yl)heptenoic acid,S 145, (+-)-isomer,S 145, (-)-isomer,S 145, (1alpha,2alpha(Z),3alpha,4alpha)-isomer,S 145, (1alpha,2alpha(Z),3beta,4alpha)-isomer,S 145, 1R-(1alpha,2beta(Z),3alpha,4alpha)-isomer,S 145, 1R-(1alpha,2beta(Z),3beta,4alpha)-isomer,S-145,S-1452,calcium 5,7-(3-phenylsulfonylaminobicyclo(2.2.1)hept-2-yl)-5-heptenoate hydrate ] TXA2/PGH2 receptor antagonist; RN given refers to (+)-isomer; RN for cpd without isomeric designation not available 10/88; S-1452 is the calcium hydrate form of S-145