Thiobarbituric acid is an organic compound and a heterocycle. It is used as a reagent in assaying malondialdehyde (the TBARS assay of lipid peroxidation).^[1]

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Thiobarbituric acid

Names
Preferred IUPAC name 2-Sulfanylidene-1,3-diazinane-4,6-dione
Other names 2-Thioxodihydropyrimidine-4,6(1H,5H)-dione 2-Thiobarbituric acid
Identifiers
CAS Number	504-17-6 Y
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL584805 N
ChemSpider	2005830 N
ECHA InfoCard	100.007.260
EC Number	207-985-8
PubChem CID	2723628
UNII	M1YZW5SS7C Y
CompTox Dashboard (EPA)	DTXSID7060124
InChI InChI=1S/C4H4N2O2S/c7-2-1-3(8)6-4(9)5-2/h1H2,(H2,5,6,7,8,9) N Key: RVBUGGBMJDPOST-UHFFFAOYSA-N N InChI=1/C4H4N2O2S/c7-2-1-3(8)6-4(9)5-2/h1H2,(H2,5,6,7,8,9) Key: RVBUGGBMJDPOST-UHFFFAOYAX
SMILES O=C(NC(N1)=S)CC1=O
Properties
Chemical formula	C4H4N2O2S
Molar mass	144.15 g/mol
Melting point	245 °C (473 °F; 518 K)
Magnetic susceptibility (χ)	-72.9·10−6 cm3/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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It is also used in Kodak Fogging Developer FD-70, part of the Kodak Direct Positive Film Developing Outfit for making black and white slides (positives).^[2]