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1,7-Dimethyl-1H-purine-2,6-dione-13C4,15N3 (2,4,5,6-13C4, 1,3,9-15N3), 1,7-Dimethylxanthine-13C4,15N3 (2,4,5,6-13C4, 1,3,9-15N3), 2,6-Dihydroxy-1,7-dimethylpurine-13C4,15N3 (2,4,5,6-13C4, 1,3,9-15N3), Paraxanthine-13C4,15N3 (2,4,5,6-13C4, 1,3,9-15N3) |
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1,3-Dimethyl-2,6,8-trihydroxypurine-13C4,15N3 (2,4,5,6-13C4, 1,3,9-15N3), 1,3-Dimethyluric acid-13C4,15N3 (2,4,5,6-13C4, 1,3,9-15N3) |
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3,7-Dimethyl-1H-purine-2,6-dione-13C4,15N3 (2,4,5,6-13C4, 1,3,9-15N3), 3,7-Dimethylxanthine-13C4,15N3 (2,4,5,6-13C4, 1,3,9-15N3), 2,6-Dihydroxy-3,7-dimethylpurine-13C4,15N3 (2,4,5,6-13C4, 1,3,9-15N3), Theobromine-13C4,15N3 (2,4,5,6-13C4, 1,3,9-15N3) |
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