Syonyms Name: Albumin blue 633; (2-Chloro-3-(2,2-dicyanoethenyl)-2-cyclopentene-1-ylidene)-2,2-dicyanoethane pyridinium salt; AB 633; Propanedinitrile, ((2-chloro-3-(2,2-dicyanoethenyl)-2-cyclopenten-1-ylidene)methyl)-, compd. with pyridine (1:1); {(E)-[2-chloro-3-(2,2