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1,3,9-TRIMETHYL-3,9-DIHYDRO -1H-PURINE-2,6-DIONE (Caffeine Impurity C), Pharmaceutical Secondary Standard; Certified Reference Material CAS 519-32-4 PubChem CID 1326
Cn1c(=O)c2ncn(C)c2n(C)c1=O -
CN1C(=O)C2N=C[N+](C)=C2N(C)C1=O