CAS 21047-89-2 appears in our catalog under these names: N–(6–Oxo–6,7–dihydro–1H–purin–2–yl)isobutyramide, N2-Isobutyrylguanine, N2-Isobutyrylguanine 98%, N-(6-Oxo-6，7-dihydro-1H-purin-2-yl)isobutyramide, 98%+, 98%+, N-(6-Oxo-6,7-dihydro-1H-purin-2-yl)isobutyramide, 97%. Offered by: GLPBio, Biosynth, Ambeed, Chemat, Fluorochem. Available pack sizes: 100g, 25g, 10g, 50g, 250g, 250mg, 1g, 5g.