| abstract |
(57) [Summary] Expression [Wherein Y is N or C—R 1 (R 1 is hydrogen, lower alkyl, hydroxy, protected hydroxy, etc.), R 2 is hydrogen, and may have an appropriate substituent. Aryl, aryloxy, etc., R 3 is hydrogen, lower alkoxy, hydroxy, protected hydroxy, etc., Z is N or C—R 4 (R 4 is hydrogen, carboxy, protected carboxy, nitro, halogen) , Hydroxy (lower) alkyl and the like, W is N or C—R 12 (R 12 is hydrogen, lower alkoxy, nitro, hydroxy or protected hydroxy).] Derivatives and their pharmaceutically acceptable salts. |