can't read?
Pivalic acid is a carboxylic acid with a molecular formula of (CH3)3CCO2H. This colourless, odiferous organic compound is solid at room temperature. The acronym for pivalate is Piv & for pivalic acid it is PivH.
P 1915 (OTTO) Pivalic acid, 98% Cas 75-98-9 - used as an internal chemical-shift standard for NMR of aqueous solutions.