EPA Method 502.2 Internal Standard

5 alpha(H),14ß(H),17ß(H),20R-3ß-Benzyloxycholestane, , Solvent-, Unit , # of units-, Cas.no.

3-Phenylpropionic acid, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 501-52-0

Ethyl caproate