Patent ID: 8901293

Claim:
A compound of the following formula Ia: in which Rz is SO 3 H R2 and R3 are alkyl; R4 is CH 2 Z, with Z having the formula R5 signifies hydrogen, alkyl, halogenomethyl, dihalogenomethyl, trihalogenomethyl, alkoxy, formylamino or alkylcarbonylamino; R6 signifies phenyl which may be substituted with 1 to 5 substituents selected from the group consisting of alkyl, hydroxyl, alkoxy, amino, alkylamino, dialkylamino and halogen; or a 5-6 membered heteroaromatic ring which may be substituted with 1 to 4 substituents selected from the group consisting of alkyl, hydroxyl, alkoxy, amino, alkylamino, carbonylamino and halogen; or a pharmaceutically acceptable salt or inner salt of said compound.