Retinoid-like activity is exhibited by compounds of the formula ##STR1## where X is S, O, or NR' where R' is hydrogen or lower alkyl; R is hydrogen or lower alkyl; A is pyridazinyl, pyrimidinyl or pyrazinyl; n is 0-4; and B is H, --COOH or a pharmaceutically acceptable salt, ester or amide thereof, --CH.sub.2 OH or an ether or ester derivative, or --CHO or an acetal derivative, or --COR.sub.1 or a ketal derivative where R.sub.1 is --(CH.sub.2).sub.m CH.sub.3 where m is 0-4, or a pharmaceutically acceptable salt thereof.
化合物的公式为##STR1##,其中X是S、O或NR',其中R'是氢或较低的烷基;R是氢或较低的烷基;A是
吡啶嗪基、
嘧啶基或
吡嗪基;n为0-4;B是H、--COOH或其药用可接受的盐、酯或酰胺,--CH.sub.2 OH或其醚或酯衍
生物,或--CHO或其
缩醛衍
生物,或--COR.sub.1或其
缩酮衍
生物,其中R.sub.1为--(CH.sub.2).sub.m CH.sub.3,其中m为0-4,或其药用可接受的盐。