N 1305 (OTTO) Naphthoresorcinol, GR 98%+ Cas no 132-86-5 - used as a spot test reagent for glycerate. N 1305 (OTTO) Naphthoresorcinol, GR 98%+ Cas no 132-86-5 - reagent for the naphthoresorcinol test of Tollens and Rorive It is also employed as a reagent for various medical tests.