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Methylthiouracil

CAS Number

56-04-2

Synonym

4-Hydroxy-2-mercapto-6-methylpyrimidine; 6-Methyl-2-thiouracil; 6-methyl-2-mercaptouracil; Alkiron; Antibason; Basecil; Basethyrin; Metacil; Methiocil; 6-methyl-2-mercaptouracil; Methyl-thiouracil; 4-methyl-2-thiouracil; 6-methylthiouracil; 6-methyl-2-thiouracil; MTU; Muracil; Orcanon; Prostrumyl; Strumacil; Thiomecil; Thiomidil; Thioryl; Thiothymin; Thiuryl; Thyreonorm; Thyreostat; Thyril; Tiomeracil; Tiotiron

Occurrence/Use

Formerly used in medicine (anti-thyroid agent)

Methylthiouracil

Cancer Potency Information

Latest Criteria: 
Proposition 65 NSRLs/MADLs
Inhalation Unit Risk (μg/cubic meter)-1: 
1.1 E-4
Inhalation Slope Factor (mg/kg-day)-1: 
4.0 E-1
Oral Slope Factor (mg/kg-day)-1: 
4.0 E-1
Comments/References: 

Proposition 65

Chemical Status

Cancer: 
Currently listed

Cancer

Listed as causing: 
Cancer
Date of Listing: 
10/01/1989
Basis for Listing: 
Labor Code

Safe Harbor Levels

Cancer
No Significant Risk Level (NSRL): 
2 µg/day
Last NSRL/MADL Revision: 
1992

Documents, Presentations, and Publications

Cancer: