can't read?
Terphenyls are a group of closely related aromatic hydrocarbons. Also known as diphenylbenzenes or triphenyls, they consist of a central benzene ring substituted with two phenyl groups
T 1268 (OTTO) p-Terphenyl, 99% Cas 92-94- - used in ionized radiation detectors, nonpolar laser dye, and single molecule optical probe of scanning near-field microscopy.