CAS# 1360926-56-2. 250 mg. OCO-Trianionic-pincer tungsten(VI)-tert-butyl-alkylidyne Veige Catalyst. IUPAC Name: (2,2-dimethylpropylidyne)bis(tetrahydrofuran); [3,3'-bis(1,1-dimethylethyl)[1,1':3',1''-terphenyl]-2,2''-diolato(3-)-κC²',κO²,κO²'']tungsten