| 摘要 |
Compounds of the formula (I) <IMAGE> (I) wherein the symbol represents a single or a double bond; Z completes a single bond or is a -CH2- group; each of R1, R2, R3 and R4, which may be the same or different is (a) hydrogen; hydroxy; halogen; cyano; C1-C6 alkyl; C1-C6 alkoxy; a C2-C4 acyl or C2-C4 acylamino group; -SR', -N(R') (R''), -CH2OR', -COR or -CH2COR, wherein R is OR' or -N(R') (R'') and each of R' and R'', being the same or different, is hydrogen or C1-C6 alkyl; or (b) one of R1, R2, R3 and R4 is 5- tetrazolyl or a group selected from -COCH2OR', -CH=C(R')-COR and -X-C(R') (R'')-COR, wherein R, R' and R'' are as defined above, and X is -O-, -S-, or -NH-, and the others are as defined above under (a); one of R5 and R6 is hydrogen and the other is hydrogen, C1-C6 alkyl, C3-C6 cycloalkyl, or a phenyl or pyridyl ring, wherein the phenyl or pyridyl ring is unsubstituted or substituted by one to three substituents chosen from hydroxy and C1-C4 alkoxy; or pharmaceutically acceptable salts thereof exhibit pharmaceutical activity as vasodilators or blood platelet aggregation inhibitors. Additionally, these compounds and their pharmaceutically acceptable salts are useful in the treatment of migraine, diabetic microangeopathy, rheumatoid arthritis, hypertension, peptic ulcers, osteoporosis, angina pectoris, atherosclerosis and dislipidaemies.
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