Abstract: There are disclosed a 4-aminophenol derivative of the formula: ##STR1## (wherein R.sup.1 and R.sup.2 each represent a lower alkyl group, Y represents a single bonding arm, a lower alkylene group or a lower alkenylene group, R.sup.3 represents a thienyl group or pyrrolyl group which may be also substituted with a lower alkyl group; benzothienyl group, indolyl group; or a phenol group which is substituted with 1 to 2 groups selected from a lower alkoxy group and a lower alkanoyloxy group; or Y-R.sup.3 represents integrally an alkyl group with 6 to 9 carbon atoms; or a hydrocarbon group with 5 to 14 carbon atoms having 2 or 3 double bonds) or a pharmacologically acceptable salt thereof, and processes for preparing the same.

Abstract: A 2-pyridinecarboxamide derivative of the formula: ##STR1## wherein R.sup.1 is hydrogen, lower alkyl, lower alkoxy, halogen, lower alkyl-thio or nitro and is in the 3rd-, 4th- or 5th-position of the pyridyl group, and R.sup.2 is hydrogen, lower alkyl, lower alkoxy, phenoxy, phenyl-lower alkyl, phenyl-lower alkenyl, or halogen. Said 2-pyridinecarboxamide derivative (I) or a pharmaceutically acceptable salt thereof is useful as an anti-allergic agent.

Abstract: N-(5-Tetrazolyl)-6-phenyl-2-pyridinecarboxamide derivatives of the formula: ##STR1## wherein R is hydrogen, a halogen, a lower alkyl or a lower alkoxy, and the phenyl ring A is a phenyl having a substituent selected from the group consisting of amino, a mono(lower)alkylamino, a di(lower)alkylamino, or a lower aliphatic acylamino, and a pharmaceutically acceptable salt thereof, and process for the preparation thereof. Said pyridinecarboxamide derivatives have excellent anti-allergic activities even by oral administration and are useful as an anti-allergic medicine.