Patent ID: 6962919

Claim:
A compound of formula wherein m is an integer from 0 to 3; R 1 , R 2 and R 3 each is (i) hydrogen or (ii) a group bound via a carbon atom, a nitrogen atom, an oxygen atom or a sulfur atom; wherein R 4 is a group of the formula: —(CH 2 ) n —NR 10 R 11 wherein n is an integer from 1 to 3; R 10 is hydrogen, a C 1-10 hydrocarbon group which may be substituted, a C 1-20 acyl group which may be substituted, a hydroxy group which may be substituted, a heterocyclic group which may be substituted, or a group of the formula: —S(O) t —R 12 wherein t is an integer from 0 to 2, and R 12 is hydrogen or a C 1-10 hydrocarbon group which may be substituted; and R 11 is hydrogen or a C 1-10 hydrocarbon group; or R 10 and R 11 form, taken together with the adjacent nitrogen atom, a cyclic amino group which may be substituted R 5 re represents (i) hydrogen, (ii) halogen or (iii) a group via a carbon atom or an oxygen atom; R 6 represents hydrogen or a group bound via a carbon atom; R 7 represents a homocyclic group which may be substituted or a heterocyclic group which may be substituted; and each dotted line represents a single bond or a double bond; or a salt thereof.