pH 4.0 Standard @ 25°C

N-(carboxymethyl)-N,N-dimethyl-N-[3-(1H,1H,2H,2H-perfluoro-1-octanesulfonamido)propan-1-yl]ammonium (6:2FTAB), 1.2ml x 50ug/ml, methanol

Acetone

Iohexol, 100mg