T 2381 (OTTO) Tris(dimethylamino) methane, 96%+ Cas 5762-56-1 used to prepare the phosphoramidite derivative of the new nucleoside analog. T 2381 (OTTO) Tris(dimethylamino) methane, 96%+ Cas 5762-56-1 - used as reagent for the introduction of the dimethylaminoethylidene group2,