Compounds that may haveanti-inflammatory activity have the generalformula (I): Wherein R1, R2, R3 are eachindependently H or a C1-4 alkyl group or a C2-4acyl group; R4 and R5 are each independently Hor a group of formula -SO3R6, wherein R6 is Hor a C1-4 alkyl group or a C2-4 acyl group; withthe proviso that at least one of R4 and R5 is agroup of formula -SO3R6, or a pharmaceuticallyacceptable salt thereof.