A highly explosive nitro compound, (CH2N.NO2)3. It has a cyclic structure with a six-membered ring of alternating CH2 groups and nitrogen atoms, with each nitrogen being attached to a NO2 group. It is made by nitrating hexamine, C6H12N4, which is obtained from ammonia and methanal. Cyclonite is a very powerful explosive used mainly for military purposes. It is also called RDX. The abbreviation is for ‘Research Department composition X’, used at the Chemical Research and Development Department, Woolwich.