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Bicyclic phosphate Bicyclic phosphate is a class of organophosphate compounds that are used as flame retardants, stabilizers and antioxidants. They are also used in spectroscopic studies. 
Some bicyclic phosphates, such as
TBPS, TBPO and IPTBO, are highly toxic. They have toxicity comparable to nerve agents. However, they are not acetylcholinesterase inhibitors. They act as GABA receptor antagonists and have potent  convulsant effects.  
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Bellet, E. M.; Casida, J. E. (14 December 1973). "Bicyclic Phosphorus Esters: High Toxicity without Cholinesterase Inhibition". Science. 182 (4117): 1135–1136. Bibcode: 1973Sci...182.1135B. doi: 10.1126/science.182.4117.1135.
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Gupta, Ramesh C., ed. (2009). Handbook of toxicology of chemical warfare agents (1st ed.). London: Academic Press. ISBN . 9780123744845
BOWERY, N. G.; COLLINS, J. F.; HILL, R. G. (17 June 1976). "Bicyclic phosphorus esters that are potent convulsants and GABA antagonists". Nature. 261 (5561): 601–603. Bibcode: 1976Natur.261..601B. doi: 10.1038/261601a0.
Ellison, D. Hank (2007). Handbook of chemical and biological warfare agents (2nd ed.). Boca Raton, Fla.: CRC. ISBN . 9780849314346