2,3,7,8-tetrachlorodibenzodioxin 2,3,7,8-tetrachlorodibenzodioxin 2,3,7,8-tetrachlorodibenzodioxin names preferred iupac name 2,3,7,8-tetrachlorooxanthrene other names 2,3,7,8-tetrachlorodibenzodioxinetetradioxintetrachlorodibenzodioxintetrachlorodibenzo-p-dioxin identifiers cas number 1746-01-6 y 3d model (jsmol) interactive image abbreviations tcdd; tcdbd chebi chebi:28119 y chembl chembl30327 y chemspider 14865 y echa infocard 100.015.566 kegg c07557 y pubchem cid 15625 unii do80m48b6o n comptox dashboard (epa) dtxsid2021315 inchi inchi=1s/c12h4cl4o2/c13-5-1-9-10(2-6(5)14)18-12-4-8(16)7(15)3-11(12)17-9/h1-4h ykey: hgufodbrklshsi-uhfffaoysa-n yinchi=1/c12h4cl4o2/c13-5-1-9-10(2-6(5)14)18-12-4-8(16)7(15)3-11(12)17-9/h1-4hkey: hgufodbrklshsi-uhfffaoyaa smiles clc1=c(cl)c=c2oc(c=c(c(cl)=c3)cl)=c3oc2=c1 properties chemical formula c12h4cl4o2 molar mass 321.96 g·mol−1 appearance colorless to white crystalline solid density 1.8 g/cm3 melting point 305 °c (581 °f; 578 k) solubility in water 0.2 μg/l log p 6.8 vapor pressure 1.5 × 10−9 mmhg hazards occupational safety and health (ohs/osh): main hazards developmental toxicant, carcinogenic ghs labelling: pictograms signal word danger hazard statements h225, h304, h315, h336, h361, h373, h401, h410 precautionary statements p201, p202, p210, p233, p240, p241, p242, p243, p260, p264, p271, p273, p280, p301+p310, p303+p361+p353, p304+p340+p312, p308+p313, p331, p332+p313, p362+p364, p370+p378, p391, p403+p233, p403+p235, p405, p501 nfpa 704 (fire diamond) 4 1 0 flash point 164.2 °c (327.6 °f; 437.3 k) niosh (us health exposure limits): pel (permissible) none rel (recommended) ca idlh (immediate danger) n.d. safety data sheet (sds) msds except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references