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This is then further nitrated into trinitrophenol or picric acid.

A subsequent investigation found that he had already obtained large supplies of the other two chemicals needed for the explosive compound — trinitrophenol or TNP — in December, court documents said.

The FBI received a report on February 1 from a chemical supplier about an attempt by Aldawsari to buy concentrated phenol, which has legitimate uses but can also can be used to make the explosive trinitrophenol, known as picric acid.

Chemically considered, it is trinitrophenol.