| abstract |
Phthalazine derivatives represented by formula (I) or pharmacologically acceptable salts or hydrates thereof, useful as therapeutic agents for erectile dysfunction, wherein R 1 and R 2 are the same or different and are each halogeno, optionally halogenated Alkyl or alkoxy or cyano; X represents cyano, nitro halogeno, optionally substituted hydroxyimino or optionally substituted heteroaryl; Y represents heteroaryl, aryl, alkynyl, alkenyl, alkyl or cyclic amine. |