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| Raloxifene-d4 HCl C28H23D4NO4S.HCl M.W. 514.08 R-011
 | | | Raloxifene-4' -glucuronide CAS No. 182507-22-8 C34H35NO10S M.W. 649.72 R-012
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| Raloxifene-6' -glucuronide CAS No. 174264-50-7 C34H35NO10S M.W. 649.72 R-013
 | | | Raloxifene-d4-4' -glucuronide CAS No. 182507-22-8(non-d) C34H31NO10SD4 M.W. 653.75 R-014
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| Raloxifene-d4-6'-glucuronide CAS No. 174264-50-7(non-d) C34H31NO10SD4 M.W. 653.75 R-015
 | | | Raloxifene-6'-Glucuronide Lithium Salt C34H34NO10S.Li M.W. 648.71 6.94 R-016
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| Raloxifene-4'-Glucuronide Lithium Salt C34H34NO10S.Li M.W. 648.71 6.94 R-017
 | | | Ramipril CAS No. 87333-19-5 C23H32N2O5 M.W. 416.52 R-021
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| Ramipril-d5 CAS No. 87333-19-5 C23H27D5N2O5 M.W. 421.55 R-022
 | | | Ramiprilat CAS No. 87269-97-4 C21H28N2O5 M.W. 388.47 R-023
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| Ramiprilat-d5 CAS No. 87269-97-4(non-d) C21H24D4N2O5 M.W. 392.49 R-024
 | | | Ramipril Acyl Glucuronide C29H40N2O11 M.W. 592.65 R-025
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| Ramiprilat Acyl Glucuronide C27H36N2O11 M.W. 564.59 R-026
 | | | Ranitidine-S-Oxide CAS No. 73851-70-4 C13H22N4O4S M.W. 330.41 R-031
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| Ranitidine-N-Oxide CAS No. 73857-20-2 C13H22N4O4S M.W. 346.41 R-032
 | | | Ranitidine-d6 CAS No. 66357-35-5 C13H16D6N4O3S M.W. 336.44 R-033
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| Ribavirin-13C2 CAS No. 36791-04-5 C8H12N4O5 M.W. 246.19 R-041
 | | | Ribavirin-13C5 CAS No. 37691-04-5 C8H12N4O5 M.W. 249.15 R-042
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| Ribavirin monophosphate C8H12N4O8P M.W. 323.18 R-043
 | | | Ribavirin 5'-Diphosphate Lithium Salt C8H12N4O11P2.2 Li M.W. 402.15 2 6.94 R-044
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| Ribavirin triphosphate C8H14N4O14P3 M.W. R-045
 | | | Risedronic acid-d4 CAS No. 105462-24-6 C7H7NO7P2D4 M.W. 287.14 R-051
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| Tetramethyl risedronate C11H19NO7P2 M.W. 339.22 R-052
 | | | Risedronic Acid Monosodium Salt C7H10NO7P2 . Na M.W. 305.10 R-053
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| Risedronic Acid C7H11NO7P M.W. 283.12 R-054
 | | | Risperidone CAS No. 106266-06-2 C23H27FN4O2 M.W. 410.50 R-061
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| Risperidone-d4 CAS No. 106266-06-2(non-d) C23H23D4FN4O2 M.W. 414.52 R-062
 | | | 9-Hydroxy risperidone CAS No. 144598-75-4 C23H27FN4O3 M.W. 426.50 R-063
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| 9-Hydroxy risperidone-d4 (Paliperidone D4) CAS No. 144598-75-4 C23H23D4FN4O3 M.W. 430.52 R-064
 | | | 7-Hydroxy risperidone CAS No. 147663-04-5 C23H27FN4O3 M.W. 426.50 R-065
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| 7-Hydroxy risperidone-d4 CAS No. 147663-04-5 C23H23D4FN4O3 M.W. 430.52 R-066
 | | | Rivastigmine-d6 tartarate CAS No. 129101-54-8 C14H16D6N2O2.C4H6O6 M.W. 406.47 R-071
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| Rivastigmine Hydrogen Tartrate C14H22N2O2.C4H6O6 M.W. 250.34 150.09 R-072
 | | | Rosiglitazone-d3 CAS No. 155141-29-0(non-d) C18H16D3N3O3S M.W. 360.45 R-081
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| Rosiglitazone Maleate C18H19N3O3S.C4H4O4 M.W. 357.43 116.07 R-0810
 | | | 5-Hydroxy rosiglitazone CAS No. 257883-22-0 C18H19N3O4S M.W. 373.43 R-082
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| N-Desmethyl rosiglitazone C17H17N3O3S M.W. 343.41 R-083
 | | | N-Desmethyl rosiglitazone-d4 C17H13N3O3SD4 M.W. 347.43 R-084
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| 5-Hydroxy rosiglitazone C18H19N3O4S M.W. 373.43 R-085
 | | | 5-Hydroxy rosiglitazone-d4 C18H15N3O4SD4 M.W. 377.46 R-086
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| 5-Hydroxy rosiglitazone sulphate potassium salt C18H18N3O7S2.K M.W. 452.49 39.10 R-087
 | | | 5-Hydroxy rosiglitazone-d4 sulphate potassium salt C18H14N3O7S2D4.K M.W. 456.51 39.10 R-088
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| Rosiglitazone C18H19N3O3S M.W. 357.43 R-089
 | | | Rosuvastatin lactone CAS No. 287714-41-4 C22H26FN3O5S M.W. 463.53 R-091
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| Rosuvastatin-d3 sodium salt CAS No. 287714-41-4 C22H24FN3O6SD3.Na M.W. 506.55 R-092
 | | | Rosuvastatin-d4 sodium salt CAS No. 287714-41-4 (non-d) C22H23FN3O6SD4.Na M.W. 507.55 R-093
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| Rosuvastatin Calcium Salt C22H27FN3O6S.0.5Ca M.W. 480.54 20.16 R-094
 | | | Retigabine Dihydrochloride C16H18FN3O2 . 2 HCl M.W. 376.22 R-101
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| Repaglinide acyl glucuronide C33H44N2O10 M.W. 628.73 R-111
 | | | Repaglinide C27H36N2O4 M.W. 452.60 R-112
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| Repaglinide-d5 C27H31N2O4D5 M.W. 457.63 R-113
 | | | 3-Hydroxy Repaglinide C27H36N2O5 M.W. 468.60 R-114
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| Rizatriptan-d6 benzoate CAS No. 162011-90-7 C15H13N5D6.C7H6O2 M.W. 397.51 R-121
 | | | Rizatriptan N-oxide C15H19N5O M.W. 285.35 R-122
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| Ropinirole CAS No. 91374-21-9 C16H24N2O M.W. 260.38 R-131
 | | | Ropinirole-d7 CAS No. 91374-21-9 (non-d) C16H17N2OD7 M.W. 267.42 R-132
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| N-Despropyl Ropinirole C13H18N2O M.W. 218.30 R-133
 | | | Riluzole CAS No. 1744-22-5 C8H5F3N2OS M.W. 234.20 R-141
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| Riluzole-13C-15N2 CAS No. 1744-22-5 (non-d) C8H2F3N2OS M.W. 237.24 R-142
 | | | Riluzole-N-glucuronide C14H10F3N2O7SD3 M.W. 413.35 R-143
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| N-Hydroxy Riluzole C8H2F3N2O2SD3 M.W. 253.22 R-144
 | | | Ramelteon CAS No. 196597-26-9 C16H21NO2 M.W. 259.35 R-151
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| Ramelteon-d5 CAS No. 196597-26-9 (non-d) C16H16NO2D5 M.W. 264.38 R-152
 | | | Ramelteon metabolite M-II (mixture of isomers) C16H21NO2D M.W. 261.37 R-153
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| Ranelic Acid CAS No. 135459-90-4 C12H10N2O8S M.W. 342.29 R-161
 | | | Ranelic Acid-d4 CAS No. 135459-90-4 (non-d) C12H6N2O8SD4 M.W. 346.31 R-162
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| Ranolazine CAS No. 95635-55-5 C24H33N3O4 M.W. 427.54 R-171
 | | | Ranolazine-d5 CAS No. 95635-55-5 (non-d) C24H28N3O4D5 M.W. 432.58 R-172
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| Ranolazine glucuronide C30H41N3O10 M.W. 603.68 R-173
 | | | Ranolazine N-oxide C24H33N3O5 M.W. 443.55 R-174
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| Rapamycin-d3 CAS No. 53123-88-9 (non-d) C51H76NO13D3 M.W. 917.22 R-181
 | | | Rapamycin CAS No. 53123-88-9 C51H79NO13 M.W. 914.20 R-182
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| Rasagiline-13C3 Mesylate CAS No. 136236-51-6 C12H13N.CH4O3S M.W. 174.21 96.11 R-191
 | | | Rasagiline CAS No. 136236-51-6 C12H13N M.W. 171.24 R-192
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| Rasagiline glucuronide C18H21NO6 M.W. 347.37 R-193
 | | | (R)-(-)-1-Aminoindan C9H11N M.W. 133.19 R-194
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| Rasagiline Mesylate C12H13N.CH4O3S M.W. 171.24 96.11 R-195
 | | | Rizatriptan Benzoate C15H19N5.C7H6O2 M.W. 269.35 122.12 R-196
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| Rabeprazole CAS No. 117976-89-3 C18H21N3O3S M.W. 359.45 R-201
 | | | Rabeprazole-d4 CAS No. 117976-89-3(non-d) C18H17N3O3SD4 M.W. 363.47 R-202
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| Rabeprazole Sodium Salt C18H20N3NaO3S M.W. 381.43 R-203
 | | | Ractopamine-d3 C18H20NO3D3 M.W. 304.41 R-211
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| Ropivacaine-d7 C17H19N2OD7 M.W. 281.45 R-221
 | | | 25-Desacetyl Rifampicin C41H56N4O11 M.W. 780.92 R-231
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| Isonicotinyl Hydrazone of 3-Formyl Rifampicin C44H52N4O13 M.W. 844.92 R-232
 | | | 1,2-Isonicotinyl Hydrazine C12H10N4O2 M.W. 242.24 R-233
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| Rifampicin CAS No. 13292-46-1 C43H58N4O12 M.W. 822.96 R-234
 | | | Rifampicin-13C-d3 CAS No. 13292-46-1 (non-labelled) C43H55N4O12D3 M.W. 826.97 R-235
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| Raltegravir CAS No. 871038-72-1 C20H20FN6O5 M.W. 444.43 R-241
 | | | Raltegravir-13C-d3 CAS No. 871038-72-1 (non-d) C20H17FN6O5D3 M.W. 447.44 39.10 R-242
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| Raltegravir glucuronide C26H29FN6O11 M.W. 620.55 R-243
 | | | Resorufin CAS No. 635-78-9 C12H7NO3 M.W. 213.19 R-251
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| Ethoxy Resorufin-d5 C14H6NO3D5 M.W. 246.28 R-252
 | | | Ethoxy Resorufin C14H11NO3 M.W. 241.25 R-253
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| Rimonabant HCl C22H21Cl3N4O.HCl M.W. 463.80 36.46 R-261
 | | | Rimonabant-d10 HCl CAS No. 158681-13-1 (non-d) C22H11Cl3N4OD10.HCl M.W. 473.95 36.46 R-262
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| Ritonavir C37H48N6O5S2 M.W. 720.96 R-271
 | | | Rhein CAS No. 478-43-3. C15H8O6 M.W. 284.23 R-281
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| Rhein-13C4 CAS No. 1189928-10-6 C15H8O6 M.W. 288.18 R-282
 | | | Rhein acyl glucuronide C21H16O12 M.W. 460.35 R-283
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| Rhein ether glucuronide C21H16O12 M.W. 460.35 R-284
 | | | Rhein monosulfate C15H8O9S M.W. 364.29 R-285
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| Rivaroxaban CAS No. 366789-02-8 C19H18ClN3O5S M.W. 435.89 R-291
 | | | Rivaroxaban-d4 CAS No. 366789-02-8 (non-d) C19H14ClN3O5SD4 M.W. 439.91 R-292
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| Rivaroxaban metabolite 5 C19H20ClN3O6S M.W. 453.90 R-293
 | | | Rivaroxaban metabolite 8 C19H18ClN3O6S M.W. 451.89 R-294
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| Rivaroxaban metabolite 9 C19H18ClN3O6S M.W. 451.89 R-295
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