Patent ID: 7732435

Claim:
A compound of the formula in which R 1 is halogen or C 1 -C 8 alky phenyl substituted with 1, 2 or 3 substituents each independently selected from halogen or cyano; R 3 is hydrogen; R 4 is hydrogen, or formyl; and N—R 5 and R 6 , taken together, are a moiety N—X—O (lbb), in which —X—is —C(═O)—or —(CH 2 ,) a —, in which a is 2 or 3 and in which any methylene group, independently from any other methylene group in the moiety lbb, is, optionally, mono-substituted by oxo or substituted by 1 or 2 substituents, selected from the group consisting of C 1 -C 6 alkyl and hydroxy-C 1 -C 6 alkyl, or N—R 5 and R 6 —, taken together, are a moiety N—C(R a )═C(R b )— (ldd), in which R a is hydrogen and R b is C 1 -C 6 alkyl, or N—R 5 and R 6 —, taken together, are a moiety N—C(R c )═N— (lee), in which R c is hydrogen, C 1 -C 6 alkyl or halo-C 1 -C 6 alkyl, or N—R 5 and R 6 —, taken together, are a moiety N—N═C(R d )— (lff), in which R d is hydrogen or C 1 -C 6 alkyl, or N—R 5 , and R 6 —, taken together, are a moiety N—N═C(R 1 )— (Ig), in which R 1 is halogen, or N—R 5 and R 6 —, taken together, are a moiety N—N═N— (Ih) or N—R 5 and R 6 —, taken together, are a moiety N—(CH 2 ,) 2 —N(H)—C(R g )H— (Iii), in which R g is hydrogen; in free form or in salt form.