Xanthine-13C15N2 Price Not Available 1mg Xanthine-13C15N2 Supplier Page Catalog Number R041475 Molecular Formula C5H4N4O2 CAS# 1262670-81-4 Purity ≥90% Inchi InChI=1S/C5H4N4O2/c10-4-2-3(7-1-6-2)8-5(11)9-4/h1H,(H3,6,7,8,9,10,11)/i5+1,8+1,9+1 Inchi Key LRFVTYWOQMYALW-XGOBPNGOSA-N SMILES C1=NC2=C(N1)C(=O)NC(=O)N2 Size 1mg Supplier Page https://www.musechem.com/product/R041475.html