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.
... after a four-year period, two-thirds elected after the next four-year period. Beside the Senate there is the Chamber of Deputies or Cāmara dos Deputados of 513 seats, ...