Resorcinol, 2000µg/ml in MeOH, 1ml

2,7-Dichloro[13C12]dibenzo-p-dioxin, 1.2ml x 50ug/ml, toluene

Sulfur (S)

Mix of 4-Nonyl-& 4-t-Octylphenols ethoxylates, in Acetone, 1ml