Phosphate (PO43-) as P

1,4,5-Trichloro(13C10)naphthalene, 1.2mL x 50ug/mL, nonane

Ethyl-t-butyl ether

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