DMEQ-TAD is a reagent for fluorescence-labeling of Vitamin D and its use in assaying Vitamin D metabolites. Alternative name: 4-[2-(6,7-Dimethoxy-4-methyl-3-oxo-3,4-dihydroquinoxalinyl)ethyl]-1,2,4-triazoline-3,5-dione. Purity: ≥98% (TLC). Solubility: Soluble in dichloromethane, acetone or chloroform. Long Term Storage: -20°C.