EPA Method 507 - Internal Standard

4-n-Octylbenzoic acid, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 3575-31-3

Cephalexin

Cimetidine (free base), neat, Solvent-neat, Unit 250mg, # of units-1, Cas.no. 51481-61-9