mercury oxycyanide mercury oxycyanide mercury oxycyanide is a chemical compound, an organomercury derivative. it is both explosive and highly toxic, producing symptoms of both mercury and cyanide poisoning following exposure. old mercury oxycyanide jar mercury oxycyanide names iupac name cyano(cyanomercuriooxy)mercury identifiers cas number 1335-31-5 y 3d model (jsmol) interactive image chemspider 62862114 echa infocard 100.014.209 pubchem cid 56843208 unii k68n3ek81v y inchi inchi=1s/2cn.2hg.o/c2*1-2;;;key: fwjgyfkckcrgiv-uhfffaoysa-n smiles c(#n)oc#n properties chemical formula c2hg2n2o molar mass 469.219 g·mol−1 density 5.94 structure crystal structure orthorhombic space group pnam lattice constant a = 18.93, b = 7.09, c = 3.90 formula units (z) 4 molecular shape rough v except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references