Another video of the failed test and rocket explosion at the Yasny test site near Orenburg
Another version from Ukrainian OSINT analysts states, that the footage may show the launch of the UR-100N intercontinental ballistic missile with the “Avangard” unit.
nitrogen tetroxide and unsymmetrical dimethylhydrazine pair, better known as amyl and heptyl.
Some rather nasty stuff, highly carcinogenic and poisonous.