3-HYDROXY-7-(4-{1-[2-HYDROXY-3-(2-HYDROXY-5-SULFO-PHENYLAZO)-BENZYL]-2-SULFO-ETHYLAMINO}-[1,2,5]TRIAZIN-2-YLAMINO)-2-(2-HYDROXY-5-SULFO-PHENYLAZO)-NAPTHALENE-1,8-DISULFONIC ACID

A2KD59 — R2 protein