Benzyltrimethylammonium Hydroxide (TBAH, TBA-OH) 1. 10%, 20%, 25%, 40%, and 55%, Aqueous Molecular Formula: (CH3CH2CH2CH2)4NOH CAS#: 2052-49-5 2. 25% and 40% in Methanol CAS#: 2052-49-5/67-56-1