tbps tbps tbps (tert-butylbicyclophosphorothionate) is a bicyclic phosphate convulsant. it is an extremely potent gaba receptor antagonist. tbps names preferred iupac name 4-tert-butyl-2,6,7-trioxa-1λ5-phosphabicyclooctane-1-thione identifiers cas number 70636-86-1 3d model (jsmol) interactive image chembl chembl485673 chemspider 94586 kegg c19930 pubchem cid 104781 comptox dashboard (epa) dtxsid7058464 inchi inchi=1s/c8h15o3ps/c1-7(2,3)8-4-9-12(13,10-5-8)11-6-8/h4-6h2,1-3h3key: vtbhbnxgfptbjl-uhfffaoysa-n smiles cc(c)(c)c12cop(=s)(oc1)oc2 properties chemical formula c8h15o3ps molar mass 222.24 g·mol−1 hazards occupational safety and health (ohs/osh): main hazards extremely toxic lethal dose or concentration (ld, lc): ld50 (median dose) 53 μg/kg (mice) except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references