Metoprolol (free base),neat,neat,50mg,

(2RS)-2-(4-n-Propylphenyl)propanoic acid, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 3585-47-5

Dalapon methyl ester, 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 17640-02-7

EPA Method 500 Series Internal Standard #5