<Tr> <Td_colspan="2"> Infobox references </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> </Tr> <P> Phosphine (IUPAC name: phosphane) is the compound with the chemical formula PH . It is a colorless, flammable, toxic gas and pnictogen hydride . Pure phosphine is odorless, but technical grade samples have a highly unpleasant odor like garlic or rotting fish, due to the presence of substituted phosphine and diphosphane (P H). With traces of P H present, PH is spontaneously flammable in air, burning with a luminous flame . Phosphines are also a group of organophosphorus compounds with the formula R P (R = organic derivative). Organophosphines are important in catalysts where they complex to various metal ions; complexes derived from a chiral phosphine can catalyze reactions to give chiral, enantioenriched products . </P> <P> Philippe Gengembre (1764 - 1838), a student of Lavoisier, first obtained phosphine in 1783 by heating phosphorus in an aqueous solution of potash (potassium carbonate). </P>

What is the formula for phosphorus trihydride commonly known as phosphine
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