Agent Name


CAS Number




Major Category



Tris(aziridinyl)phosphine sulfide; 1,1',1''-Phosphinothioylidynetrisaziridine; Aziridine,1,1',1'-phosphinothioylidynetris-; Girostan; Ledertepa; N,N',N"-Triethylenethiophosphamide; N,N',N"-Triethylenethiophosphoramide; N,N',N''-Tri-1,2-ethanediylphosphorothioic triamide; N,N',N''-Tri-1,2-ethanediylthiophosphoramide; N,N',N''-Triethylenephosphorothioic triamide; N,N',N''-Triethylenethiophosphortriamide; Oncotepa; Oncothio-tepa; Oncotiotepa; Phosphine sulfide, tris(1-aziridinyl)-; Phosphorothioic acid triethylenetriamide; Phosphorothioic triamide, N,N',N"-triethylene-; Phosphorothioic triamide, N,N',N''-tri-1,2-ethanediyl-; SK 6882; Stepa; Tespa; Tespamin; Tespamine; Thio-tep; Thio-tepa; Thio-tepa S; Thiofozil; Thiophosphamide; Thiophosphamidum; Thiophosphoramide, N,N',N"-triethylene-; Thiophosphoramide, N,N',N''-tri-1,2-ethanediyl-; Thioplex; Thiotef; Thiotepum [INN-Latin]; Thiotriethylenephosphoramide; Tifosyl; Tio TEF; Tiofosfamid; Tiofosyl; Tiofozil; Tiotepa [INN-Spanish]; Tri(ethyleneimino)thiophosphoramide; Tri-1-aziridinylphosphine sulfide; Triaziridinylphosphine sulfide; Triethylene thiophosphoramide; Triethylenethiophosphoramide; Triethylenethiophosphorotriamide; Tris(1-aziridinyl)phosphine sulfide; Tris(1-aziridinyl)phosphine sulphide; Tris(ethylenimino)thiophosphate; TSPA; WR-45312; [ChemIDplus]


Insect Sterilants


White odorless solid; [CAMEO]


Used as an insect sterilant and antineoplastic; [Merck Index] Use as a therapeutic agent has largely been replaced by selected nitrogen mustards; Has been widely tested for use as an intermediate for polymeric flame retardants for cotton, but in not likely used commercially in the US for this purpose; An effective insect chemosterilant that has never been marketed due to problems with application to insects, toxicity, and environmental effects; [NTP]


Single doses of 5 mg/kg administered on days 11 or 12 of gestation produced teratogenic effects in mice; Cytotoxic and genotoxic effects observed in male germ cells of mice and hamsters; [REPROTOX] "It causes skin, gastrointestinal, CNS, and bone marrow damage." [ChemIDplus] May polymerize on exposure to heat or moisture; [CAMEO] May cause irritation; Highly toxic by ingestion; Targets the bone marrow; [Sigma-Aldrich MSDS] See "Tris(1-aziridinyl)phosphine oxide."

Exposure Assessment
Vapor Pressure

0.00845 mm Hg

Adverse Effects
Reproductive Toxin


IARC Carcinogen

Known Carcinogen

NTP Carcinogen

Human Carcinogen

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Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information


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