Patent ID: 8722938

Claim:
A compound of general formula (I): wherein , , are each independently a single or double bond; R a is selected from an straight or branched C 1 -C 5 alkyl, straight or branched C 2 -C 5 alkenyl, straight or branched C 2 -C 5 alkynyl and —C(═O)R d , each optionally substituted by at least one group selected from —OH, COOH, —NH 2 , C 1 -C 5 amine, halogen, phenyl, heteroaryl; wherein R d is selected from the group consisting of —H, —OH, straight or branched C 1 -C 5 alkyl, straight or branched C 2 -C 5 alkenyl, straight or branched C 2 -C 5 alkynyl, straight or branched C 1 -C 5 alkoxy, —NR e R f ; R e and R f are each independently selected from H and straight or branched C 1 -C 5 alkyl; and R b and R c are each independently selected from —H, —OH, ═O, ═CR g R h , ═NR i , ═S, —C 5 -C 15 aryl ring substituted by at least one group selected from a straight or branched C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 2 -C 12 alkynyl, C 1 -C 12 alkoxy, amine, C 1 -C 12 alkoxycarboxylic acid, —OH, —OC(═O)R p and —C(═O)R q ; wherein R g , R h , R i , R p and R q are each independently selected from H, straight or branched C 1 -C 5 alkyl, straight or branched C 1 -C 5 alkoxy and —NH 2 ; and provided that at least one of R b and R c is said substituted —C 5 -C 15 aryl ring; wherein at least one of R b and R c is a group of formula (II′): wherein R j and R k are each independently selected from H, and —OR n , wherein R n is selected from H, a straight or branched C 1 -C 5 alkyl, provided that at least one of R j and R k is different than H; R m is selected from a straight or branched C 3 -C 12 alkyl, and R mm is H.