Caffeine

2-Ethyl-3,(5/6)-dimethylpyrazine, Isomer mixture, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-, Cas.no. 27043-05-6 or 55031-15-7

Anions Mix

n-Hexane-d14, 1000µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 21666-38-6