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| 5-Methyl Uridine-d4 CAS No. 82845-85-0 C10H10N2O6D4 M.W. 262.26 U-011
 | | | Uridine C9H12N2O6 M.W. 244.21 U-012
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| Ursodiol-d4 C24H36O4D4 M.W. 396.61 U-021
 | | | Glycoursodiol-d4 C26H39NO5D4 M.W. 453.66 U-022
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| Tauroursodiol-d4 C26H41NO6SD4 M.W. 503.74 U-023
 | | | Ursodeoxycholic-2,2,4,4-d4 acid C24H36O4D4 M.W. 396.61 U-024
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| Tauroursodiol CAS No. 128-13-2 C26H45NO6S M.W. 499.72 U-025
 | | | Glycoursodeoxycholic Acid C26H43NO5 M.W. 449.64 U-026
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| Udenafil CAS No. 268203-93-6 C25H36N6O4S M.W. 516.67 U-031
 | | | Ulifloxacin CAS No. 112984-60-8 C16H18FN3O3S M.W. 351.40 U-041
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| Ulifloxacin-d8 CAS No. 112984-60-8 (non-d) C16H10FN3O3SD8 M.W. 359.46 U-042
 | | | Ulifloxacin Acyl Glucuronide C22H26FN3O9S M.W. 527.53 U-043
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| Uracil CAS No. 66-22-8 C4H4N2O2 M.W. 112.09 U-051
 | | | Uracil-13C-15N2 CAS No. 66-22-8 (non-labelled) C4H4N2O2 M.W. 115.06 U-052
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