can't read?
Tetramethylammonium hydroxide (TMAH or TMAOH) is a quaternary ammonium salt with the molecular formula N(CH3)4+ OH−.
T 1476 (OTTO) Tetramethylammonium hydroxide 25% in methanol - used as a basic solvent in the development of acidic photoresist in the photolithography process, and is highly effective in stripping photoresist.