O,O'-di-(3-(2-carboxy-8-oxo-7-(2-thiophen-2-yl-acetylamino)-5-thia-1-azabicyclo(4.2.0)oct-2-en-3-yl)allyl)-2',7'-dichlorofluorescein
o,o'-di-(3-(2-carboxy-8-oxo-7-(2-thiophen-2-yl-acetylamino)-5-thia-1-azabicyclo(4.2.0)oct-2-en-3-yl)allyl)-2',7'-dichlorofluorescein