Classify each chemical compound: P4S7, Crp, Pb(MnO4)2

P4S7: This compound is called tetraphosphorus heptasulfide. It is an example of an inorganic compound.

Crp: It seems like "Crp" may not be a recognized chemical compound. It does not match any known chemical formula or name.

Pb(MnO4)2: This compound is called lead(IV) permanganate. It is an inorganic compound.