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R-salt (TNX, systematic namehexahydro-1,3,5-trinitroso-1,3,5-triazine), is an organic compound that has been used as an homemade explosive. As a high explosive, it is less sensitive than other compounds of similar availability. It has a similar structure to RDX but is less commonly used. It is also found as a decomposition product of RDX in the environment, such as after RDX detonation. Using chemistry similar to the synthesis of RDX, R-salt can be synthesized by reaction of hexamine with nitrous acid in the presence of an acid catalyst.