Patent ID: 8178704

Claim:
A compound of formula (I): in which: the substituents R 1 , R 2 , R 3 , R 4 , R 5 , R 6 are chosen from: —OH, —OPO 3 2− , —OPO(OH) 2 or —OPO(OH)O − , —(OCONH) q -L-G or —(OCONH) q -L-M, provided that only one of the substituents R 1 to R 6 is a group —OPO 3 2− , —OPO(OH) 2 or —OPO(OH)O − , and one or two of the other substituents R 1 to R 6 is one of the groups —(OCONH) q -L-G or —(OCONH) q -L-M, the other substituents R 1 to R 6 being the groups —OH; where: L is a linkage group, G is a reactive group, M is a conjugated substance or molecule chosen from the following group: a tracer, an immunogen, a member of the pair of binding partners, a solid support, q is equal to 1.