Diagram of a molecule of this compound (bottom).
Mooride polyronite 4 is one of many explosive materials available to the crew of the USS Enterprise-D in 2367 when they were trapped in a Tyken's Rift.
According to the database, this material is a "slow-burning chemical explosive used for controlled pressure wave ignition of small-scale fusion reactions. Stored in inert liquid form, activated by laser detonator." (TNG: "Night Terrors")
A molecular structure diagram of this material appeared in an okudagram display of explosives listed in the Enterprise-D library computer.
This one in particular appears to be a reference to writer Ronald D. Moore and visual effects coordinator Ronald B. Moore, with "poly-ron" referring to "more than one Ron."