| abstract |
Compounds of formula I,n nwhereinn R 1 represents C 1-4 alkoxy optionally substituted by one or more fluorine atoms; R 2 and R 3 independently represent H or C 1-6 alkoxy (which is optionally substituted); R 4 represents a 4-, 5-, 6- or 7-membered heterocyclic ring, the ring being optionally fusednto a benzene ring or a 5- or 6-membered heterocyclic, the ring system as a whole beingnoptionally substituted; X represents CH or N; and L is absent, n or represents a cyclic group of formula Ia,n n or represents a chain of formula Ib,n nand pharmaceutically acceptable salts thereof; are useful in therapy, in particular in thentreatment of benign prostatic hyperplasia. |