Aqueous Ethanol Standard (3,0g/l), 10 x 1,2ml

2,3,4,5-Tetrabromobenzoic acid, 1.2ml x 50ug/ml, methanol

25-Hydroxyvitamin D3-d6 (Dimethyl 26,27-d6)

rac-(1R,2R,5R,6R,9S,10S)-5,6-dibromo-1,10,11,, 1.2ml x 50ug/ml, toluene