Flavilium compounds and method of using

The invention relates to a compound of formula (I) (I) wherein X is a pharmacologically acceptable anion, R1 and R2 are independently of each other hydrogen, or an -OY group in which Y is hydrogen, an alpha -aminoacyl, or a C1-5 aminoalkyl residue, R3, R4 and R7 are independently of each other hydrogen, or a C1-5 alkyl residue R5 is hydrogen, and alpha -aminoacyl, or a C1-5 alkyl residue, and R6 is hydrogen, OH-, or a C1-5 alkyl residue, and pharmaceutically acceptable salts and esters thereof; and to condensation processes for preparing them. The invention relates to a compound of formula (I) acceptable anion, R1 and R2 are independently of each other hydrogen, or an -OY group in which Y is hydrogen, an alpha -aminoacyl, or a C1-5 aminoalkyl residue, R3, R4 and R7 are independently of each other hydrogen, or a C1-5 alkyl residue R5 is hydrogen, and alpha -aminoacyl, or a C1-5 alkyl residue, and R6 is hydrogen, OH-, or a C1-5 alkyl residue, and pharmaceutically acceptable salts and esters thereof; and to condensation processes for preparing them.