Novel .alpha.-phenyl-2-(aza)benzothiazolylthioglycolic acids, derivatives thereof and pharmacologically acceptable salts thereof are disclosed, as well as their use as intermediates in the preparation of 2-substituted-3-hydroxy-thiazolo[2,3-b]-benzothiazolium salts, 2-substituted-thiazolo[2,3-b]benzothiazol-3(2H)-one mesoionic didehydro derivatives, 2-substituted-thiazolo[2',3'-2,3]thiazolo[5,4-b]pyridin-3(2H)-one mesoionic didehydro derivatives and related compounds, and their use as modulators of the immune response.
                            新型α-苯基-2-(氮杂)
苯并噻唑硫代乙酸及其衍
生物和药理学上可接受的盐被披露,以及它们作为2-取代-3-羟基
噻唑并[2,3-b]-
苯并噻唑盐、2-取代
噻唑并[2,3-b]
苯并噻唑-3(2H)-酮中间体的用途,2-取代
噻唑并[2',3'-2,3]
噻唑并[5,4-b]
吡啶-3(2H)-酮中间体和相关化合物,以及它们作为免疫应答调节剂的用途。