1-Benzopyrylium, 8-(5-(6,7-dihydro-2,4-bis(4-(pentyloxy)phenyl)-5H-1-benzopyran-8-yl)-2,4-pentadienylidene)-5,6,7,8-tetrahydro-2,4-diphenyl-, perchlorate 21016-22-8 39289-11-7 39363-75-2 39465-15-1 Q-Switch II dye