Patent ID: 8835659

Claim:
Compounds of general formula (I), wherein: R 1 and R 3 are hydroxyl; R 2 and R 4 are, independently of each other, selected from the group consisting of alkoxy of linear or branched alkyl chain, hydrogen, halogen, nitro, cyano and hydroxyl, or wherein either pair R 1 R 2 , R 2 R 3 or R 3 R 4 together form a phenyl group; one of X and Y is hydrogen, C 1 -C 3 alkyl, or halogen; and the other one is a group of formula (V): wherein: R 5 and R 7 are, independently of each other, selected from the group consisting of hydrogen, halogen, hydroxy, nitro, cyano and alkoxy of linear or branched alkyl chain, R 6 is selected from the group consisting of —F, hydroxyl, —O—(C 1 -C 3 alkyl), nitro, and cyano, Z represents a —(C—R 8 )— group wherein, R 8 is selected from the group consisting of hydrogen, hydroxyl, nitro, cyano and alkoxy of linear or branched alkyl chain; with the proviso that at least two of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 or R 8 are hydroxyl or alkoxy group of linear or branched alkyl chain; and with the proviso that at least three of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 or R 8 are not hydrogen; or a salt thereof.