N,N'-[(3',6'-二羟基-3-氧代螺[异苯并呋喃-1(3H),9'-[9H]氧杂蒽]-4',5'-二基)二(亚甲基)]二[N-(2-乙氧基-2-氧代乙基)甘氨酸] 1,1'-二乙酯

N,N'-[(3',6'-Dihydroxy-3-oxospiro[isobenzofuran-1(3H),9'-[9H]xanthene]-4',5'-diyl)bis(methylene)]bis[N-(2-ethoxy-2-oxoethyl)-glycine] 1,1'-diethyl ester