Metformin hydrochloride, 250mg

EPA Method 8260B Purgeable Internal Standard

N-Methyl-N'-nitro-N-nitrosoguanidine (wetted with ca. 50% water), neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 70-25-7

Benzophenone-d10, 100μg/ml in Acetonitrile, 5ml