Dibromoacetic acid

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

Adenine, 25g

D12-Benzo[a]pyrene, 10.0 µg/ml, Acetonitrile, 10