Chloroform-13C,2000 µg/mL,MeOH,1mL,

Chlorbufam, 100 µg/ml, Acetonitrile, 5ml

Theobromine, 100µg/ml in MeOH, 5ml

1,2,3,4,5-Pentachloro[13C6]benzene, 1.2ml x 100ug/ml, isooctane