EPA Method 8121 Internal Standard

1,2-Dibromoethylbenzene,1000 µg/mL,isooctane,1mL,

D7-Penicillin G N-Ethylpiperidinium salt, 10mg

N-(4-chloro[13C6]phenyl)-N'-(3,4-dichloro[13C6]phenyl)[13C]urea , 1.2ml x 50ug/ml, methanol