"Nitrostyrene" is sometimes used to refer to the whole class of chemicals featuring the phenyl-ethylene-nitro linkage. So it's not wrong to call it "the nitrost

"Nitrostyrene" is sometimes used to refer to the whole class of chemicals featuring the phenyl-ethylene-nitro linkage. So it's not wrong to call it "the nitrostyrene method". But the specific nitrostyrene that is a precursor to methamphetamine is 1-phenyl-2-nitro-propene, while the parent compound "nitrostyrene" is 1-phenyl-2-nitro-ethene.