2-(2,4,5,7-tetrabromo-3,6-dihydroxyxanthen-9-yl)benzoic acid, zirconium salt

2,4,5,7-Tetrabromo-3,6-dihydroxyspiro[9H-xanthene-9,1'(3'H)-isobenzofuran]-3'-one/zirconium,(1:x) salt