PROPYLTHIOURACIL This substance was considered by previous working groups, in 1974 (IARC, 1974) and 1987 (IARC, 1987). Since that time, new data have become available, and these have been incorporated into the monograph and taken into consideration in the present evaluation. 1. Exposure Data 1.1 Chemical and physical data 1.1.1 Nomenclature Chem. Abstr. Serv. Reg. No.: 51-52-5 Deleted CAS Reg. No.: 500-50-5 Chem. Abstr. Name: 2,3-Dihydro-6-propyl-2-thioxo-4(1H)-pyrimidinone IUPAC Systematic Name: 6-Propyl-2-thiouracil Synonyms: 6-n-Propyl-2-thiouracil; 6-n-propylthiouracil; 6-propyl-2-thio-2,4- (1H,3H)pyrimidinedione; 6-propylthiouracil; PTU; 2-thio-4-oxy-6-propyl-1,3-pyri- midine; 2-thio-6-propyl-1,3-pyrimidin-4-one 1.1.2 Structural and molecular formulae and relative molecular mass C 7 H 10 N 2 OS Relative molecular mass: 170.24 –91– N N OH CH 2 HS CH 2 CH 3 HN N O H CH 2 S CH 2 CH 3
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