3-Carboxy-6-chloro-7-hydroxycoumarin: A highly fluorescent, water-soluble violet-excitable dye for cell analysis - Abrams, Barny; Diwu, Zhenjun; Guryev, Oleg; Aleshkov, Sergei; Hingorani, Ravi; Edinger, Mark; Lee, Rita; Link, Joe; Dubrovsky, Tim (Analytical Biochemistry, 2009)