Coumarin-d4 (Standard) is the standard substance of Coumarin-d4, and it is applicable for quantitative analysis, quality control, and related research in biochemical experiments. Coumarin-d4 is a deuterated compound of Coumarin. Coumarin has a CAS number of 91-64-5. Coumarin is a chemical compound/poison found in many plants, notably in high concentration in the tonka bean, woodruff, and bison grass. It has clinical value as the precursor for several anticoagulants, notably warfarin.