CAS 27258-33-9 appears in our catalog under these names: 1-Methyl-1H-pyrazole-5-carbaldehyde, 97%, 1-Methyl-1h-pyrazole-5-carbaldehyde oxalate, 95%, 1–Methyl–1H–pyrazole–5–carboxaldehyde, 1-Methylpyrazole-5-carboxaldehyde, >95.0%(GC), 1-Methyl-1H-pyrazole-5-carbaldehyde, 97% . Offered by: Combi-blocks, GLPBio, TCI, Thermo Scientific, Ambeed. Available pack sizes: 10g, 5g, 25g, 100g, 1g, 250MG, 500g, 50g.