Anthraquinone derivatives and their use as protein absorbents

Abstract

A compound of the formula: ##STR1## wherein X is a non-chromophoric bridging group which provides at least three single covalent bonds between Ring B and the group R; R is a group containing a reactive halogen atom; and each A independently is H or an acidic group; provided that the molecule contains sufficient acidic groups to render it water soluble and then when X provides only 3 covalent bonds between Ring B and R, the latter is not a chlorodifuoropyrimidyl group, which is suitable for the preparation of a protein adsorbent or precipitant for use in the separation of mixtures of proteins.

Dependencies are inferred from the claim text.