Thiotepa (thiotepa (thiotepa injection) injection) for Injection USP is an ethylenimine-type compound. It is supplied as a non-pyrogenic, sterile Iyophilized powder for intravenous, intracavitary or intravesical administration, containing 15 mg of thiotepa (thiotepa injection) . Thiotepa (thiotepa (thiotepa injection) injection) is a synthetic product with antitumor activity. The chemical name for thiotepa is Tris (1-aziridinyl) phosphine sulfide. Thiotepa (thiotepa (thiotepa injection) injection) has the following structural formula: