can't read?
Tetrabutylammonium hydroxide is the chemical compound with the formula (C4H9)4NOH, abbreviated Bu4NOH with the acronym TBAOH or TBAH.
T 1306 (OTTO) Tetrabutylammonium hydroxide 25% in methanol Cas 2052-49-5 - used often under phase-transfer conditions to effect alkylations and deprotonations.