Patent ID: 8207180

Claim:
A compound of the formula (I): wherein the ring A represents a fused heterocycle of the formula IIa, IIb, III or IV: R 1 represents hydrogen atom or an optionally substituted group selected from alkyl, cycloalkyl, alkenyl, alkynyl, heterocyclyl, aryl, heterocyclyloxy-alkyl and alkoxycarbonyl group; R 2 is hydrogen or halogen atom or a group of formula —COOR 5 or —CONHR 5 , wherein R 5 represents one of the meanings above defined for R 1 , or an optionally substituted aryl or heterocyclyl group; R 3 is hydrogen atom or a group of formula —CHO, —COOR 5 or —CONHR 5 , wherein R 5 is as defined above; R 4 is hydrogen atom or NHR 6 , wherein R 6 is hydrogen atom or an optionally substituted alkyl, aryl or heterocyclyl group; ----- means either single or double Carbon-Carbon bond (—CH 2 —CH 2 — or —CH═CH—); or a pharmaceutically acceptable salt thereof; with the provisos that if R 2 is hydrogen or halogen atom or an optionally substituted aryl or heterocyclyl group, then R 3 is not hydrogen atom, and if the ring A is a fused heterocycle of the formula III, R 3 and R 4 are hydrogen atoms, and ----- means double Carbon-Carbon bond (—CH═CH—), then R 2 is not COOH, COO-Alkyl, the compound 1H-pyrrolo[2,3-f]isoquinoline-3-carboxaldehyde is excluded.