5,6-dimethyl-2-Thiouracil (Standard) is the standard substance of 5,6-dimethyl-2-Thiouracil, and it is applicable for quantitative analysis, quality control, and related research in biochemical experiments. 5,6-dimethyl-2-Thiouracil is a heterocyclic building block that has been used in the synthesis of anti-HIV-1 pyrimidinones.1 It has also been used as an internal standard for the quantification of thyreostats, including 2-thiouracil, in bovine plasma.2