N-(6-(diethylamino)-9-(4-((2,5-diaza-1,9-dicarboxy-4-(((((mannopyranos-1-yloxy)phenylamino)carbonyl)methyl)thiomethyl)-3,6-dioxononyl)aminosulfonyl)-2-sulfophenyl)-3H-xanthene-3-ylidene)-N-ethylethanaminium