11-dehydro TXB2-d4 contains 4 deuterium atoms at the 3, 3', 4, and 4' positions. It is intended for use as an internal standard for the quantification of 11-dehydro TXB2 by GC- or LC-mass spectrometry. 11-dehydro TXB2 is a urinary metabolite of TXB2 and TXA2.