2,2',2'',2'''-(((3',6'-二羟基-3-氧代-3H-螺环[异苯并呋喃-1,9'-氧杂蒽]-2',7'-二基)双(亚甲基))双(氮杂三甲酰基))四乙酸

2,2',2'',2'''-(((3',6'-Dihydroxy-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-2',7'-diyl)bis(methylene))bis(azanetriyl))tetraacetic acid