Synonyms: Rhodamine 640 perchlorate;CCRIS 4957;1H,5H,11H,15H-Xantheno(2,3,4-ij:5,6,7-i'j')diquinolizin-18-ium, 9-(2-carboxyphenyl)-2,3,6,7,12,13,16,17-octahydro-, perchlorate;1H,5H,11H,15H-Xantheno(2,3,4-ij:5,6,7-i'j')diquinolizin-18-ium, 9-(2-carboxyphenyl)-2,3,6,7,12,13,16,17-octahydro-, perchlorate (1:1);9-(2-Carboxyphenyl)-2,3,6,7,12,13,16,17-octahydro-1H,5H,11H,15H-xantheno(2,3,4-ij:5,6,7-i'j')diquinolizin-18-ium perchlorate;9-(2-carboxyphenyl)-2,3,6,7,12,13,16,17-octahydro-1H,5H,11H,15H-pyrido[3,2,1-ij]quinolizino[1',9':6,7,8]chromeno[2,3-f]quinolin-4-ium perchlorate