[(4-oxo-4H-chromen-3-yl)hydroxymethyl]- or [(4-oxo-4H-chromen-3-yl)methyl]phosphonic acid derivatives

摘要

The present invention relates to compounds of the formula (I), where R1 to R3 each, independently of one another, denote H, hydroxyl or alkoxy having 1 to 8 C atoms, R4 denotes alkyl having 1 to 4 C atoms, H, hydroxyl or alkoxy having 1 to 8 C atoms, R5 denotes H or hydroxyl, and R6 denotes H or alkyl having 1 to 18 C atoms, or salts thereof, but where all R1 to R4 together cannot be equal to H, to compositions, and to the preparation and use thereof.