Nitrite as NO2-

Metoprolol (free base), 1000µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 51384-51-1

2-Amino-1-methyl-6-phenylimidazo[4,5-b]py ridine (PhIP), 5mg

Methyl octanoate (Methyl caprylate), 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 111-11-5