Compounds 20–22, targeting to salivary glands and thyroid glands, and biodistribution of resected organs in CD-1 mice. Ten nmol of each fluorophore was injected intravenously into 25 g CD-1 mice 4 h prior to imaging and resection. Abbreviations used are Du, duodenum; He, heart; In, intestine; Ki, kidneys; Li, liver; Lu, lungs; Mu, muscle; Pa, pancreas; SG, salivary gland, Sp, spleen. Arrows indicate the targeted gland.