NEW MATERIAL:A compound of formula I [M is H or alkali metal; R<1> is H, COOH, lower alkyl, lower alkoxy, acylamino, etc.; R<2> is H, lower alkyl, lower alkoxy or halogen; R<3> is H or (substituted) lower alkyl; X is (substituted) phenylene or naphthylene; Y is -SO2CH=...