IR DYE 961ABS; QUINOLINIUM, 4-[2-[2-CHLORO-3-[(1-ETHYL-4(1H)-QUINOLINYLIDENE)ETHYLIDENE]-1-CYCLOHEXEN-1-YL]ETHENYL]-1-ETHYL-, SALT WITH 4-METHYLBENZENESULFONIC ACID (1:1); 4-[(E)-2-[(3E)-2-chloro-3-[(2E)-2-(1-ethyl-4-quinolylidene)ethylidene]cyclohexen-1-yl]vinyl]-1-ethyl-quinolin-1-ium; 4-methylbenzenesulfonate