Unsymmetrical dimethylhydrazine (UDMH) (1,1-Dimethylhydrazine) is a hypergolicrocket fuel[?] ingredient, often used in combination with the oxidiser, nitrogen tetroxide.
UDMH is toxic, and can explode in the presence of oxidisers.
... from November 1940. Head of the French section was colonel Maurice Buckmaster[?]. They sent weapons, radios and radiomen and advisors. One of their agents was reputedly ...