Synthesis and Properties of 4,4'-Bis[5-alkyl(aryl)benzoxazol-2-yl]-2-hydroxy(alkoxy)biphenyls. -Derivatives (I) containing a free hydroxy group in the 2-position exhibit properties of fluorescent pH-indicators. Moreover, the corresponding sodium salts possess abnormally high Stokes shifts. -(OL'KHOVIK, V. K.; MATVEENKO, Y. V.; KALECHITS, G. V.; PAP, A. A.; ZENYUK, A. A.; Russ. J.