4-Thiouracil

4-Thiouracil is a heterocyclic organic compound having a pyrimidine skeleton. It is a derivative of the nucleobase uracil with a sulfur instead of oxygen in position 4. It is found naturally in the 4-thiouridine nucleotide.

4-Thiouracil

Names
Preferred IUPAC name 4-Sulfanylidene-3,4-dihydropyrimidin-2(1H)-one
Identifiers
CAS Number	591-28-6 Y
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL1650608 Y
ChemSpider	2016146 Y
ECHA InfoCard	100.155.914
MeSH	Thiouracil
PubChem CID	2734394
CompTox Dashboard (EPA)	DTXSID50207840
InChI InChI=1S/C4H4N2OS/c7-4-5-2-1-3(8)6-4/h1-2H,(H2,5,6,7,8) Key: OVONXEQGWXGFJD-UHFFFAOYSA-N
SMILES O=C1\C=C/NC(=S)N1
Properties
Chemical formula	C4H4N2OS
Molar mass	128.15 g·mol−1
Melting point	295 °C (563 °F; 568 K) (decomp.)
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312, H332
Precautionary statements	P261, P264, P270, P271, P280, P301+P312, P302+P352, P304+P312, P304+P340, P312, P322, P330, P363, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references