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| Mefenamic acid-d4 CAS No. 61-68-7 C15H11D4NO2 M.W. 245.32 M-011
 | | | Mefenamic acid-acyl-β-D-glucuronide C21H23NO8 M.W. 417.42 M-012
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| Meloxicam CAS No. 71125-38-7 C14H13N3O4S2 M.W. 351.41 M-021
 | | | Meloxicam-d3 CAS No. 71125-38-7 C14H10D3N3O4S2 M.W. 354.42 M-022
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| 5'-Carboxy Meloxicam C14H11N3O6S2 M.W. 381.39 M-023
 | | | 5'-Hydroxy Meloxicam C14H13N3O5S2 M.W. 367.40 M-024
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| Meperidine-d4 CAS No. 53484-73-4 C15H17D4NO2 M.W. 251.30 M-031
 | | | 4-Hydroxy mephenytoin CAS No. 61837-65-8 C12H11D3N2O3 M.W. 234.26 M-041
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| 4-Hydroxy Mephenytoin-d3 CAS No. 61837-65-8(non-d) C12H11D3N2O3 M.W. 237.28 M-042
 | | | N-Desmethyl Mephenytoin-d5 C11H7D5N2O2 M.W. 209.26 M-043
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| (S)-4-Hydroxy Mephenytoin C12H14N2O3 M.W. 234.26 M-044
 | | | Metaxalone CAS No. 1665-48-1 C12H15NO3 M.W. 221.26 M-051
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| Metaxalone-d6 CAS No. 1665-48-1(non-d) C12H9D6NO3 M.W. 227.29 M-052
 | | | Methaqualone-d7 CAS No. 136765-41-8 C16H7D7N2O M.W. 257.24 M-061
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| Methoxsalen-d3 CAS No. 298-81-7 C12H5D3O4 M.W. 217.24 M-071
 | | | alpha-Hydroxy Metoprolol CAS No. 56392-16-6 C15H25NO4 M.W. 283.37 M-081
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| (S)-(-)-Metoprolol CAS No. 81024-42-2 C15H25NO3 M.W. 267.37 M-082
 | | | (R)-(+)-Metoprolol CAS No. 81024-43-3 C15H25NO3 M.W. 267.37 M-083
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| Metoprolol-d6 C15H19NO3D6 M.W. 273.41 M-084
 | | | N-Desmethyl mianserin CAS No. 57257-81-5 C17H18N2 M.W. 250.35 M-091
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| 8-Hydroxy mianserin CAS No. 102335-57-9 C17H18N2 M.W. 280.37 M-092
 | | | Mirtazapine-d4 HCl CAS No. 61337-67-5 (non-d) C17H15D4N3.HCl M.W. 305.82 M-101
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| Desmethyl mirtazapine HCl C16H17N3.HCl M.W. 287.79 M-102
 | | | Desmethyl mirtazapine-d4 HCl C16H13D4N3.HCl M.W. 291.79 M-103
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| 8-Hydroxy mirtazapine CAS No. 102335-57-9 C17H19N3O M.W. 281.36 M-104
 | | | 8-Hydroxy mirtazapine-d4 CAS No. 102335-57-9(non-d) C17H15D4N3O M.W. 285.38 M-105
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| Midodrine-d6 HCl CAS No. 3092-17-9 (non-d) C12H12D6N2O4.HCl M.W. 296.78 M-111
 | | | Minoxidil-d10 CAS No. 38304-91-5 C9H5D10N5O M.W. 219.31 M-121
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| Minoxidil-d10 sulfate CAS No. 83701-22-8(non-d) C9H5D10N5O4S M.W. 299.37 M-122
 | | | Minoxidil glucuronide CAS No. 56828-40-1 C15H23N5O7 M.W. 385.38 M-123
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| Mirtazapine-d4 CAS No. 61337-67-5 (non-d) C17H15D4N3 M.W. 269.39 M-133
 | | | Mometasone furoate-d3 CAS No. 83919-23-7 C27H27D3Cl2O6 M.W. 524.46 M-141
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| Methotrimeprazine-d3 C19H21N2OSD3 M.W. 331.50 M-151
 | | | Methotrimeprazine Sulfoxide C19H24N2O2S M.W. 344.48 M-152
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| Mycophenolic Acid Phenyl Glucuronide C23H28O12 M.W. 496.47 M-161
 | | | Mycophenolic acid glucuronide cyclopropane analogue C24H30O12 M.W. 510.50 M-162
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| Mycophenolic acid CAS No. 24280-93-1 C17H20O6 M.W. 320.35 M-163
 | | | Mycophenolic acid-d3 CAS No. 24280-93-1 C17H17O6D3 M.W. 323.36 M-164
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| Mycophenolate mofetil CAS No. 115007-34-6 C23H31NO7 M.W. 433.51 M-165
 | | | Mycophenolate mofetil-d4 CAS No. 115007-34-6 (non-d) C23H27D4NO7 M.W. 437.51 M-166
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| Mycophenolic acid acyl glucuronide C23H28O12 M.W. 496.47 M-167
 | | | Mycophenolic acid glucoside C23H30O11 M.W. 482.49 M-168
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| N-Acetyl Mesalamine CAS No. 51-59-2 C9H9NO4 M.W. 195.18 M-171
 | | | N-Acetyl Mesalamine-d3 CAS No. 51-59-2(non-d) C9H6NO4D3 M.W. 198.19 M-172
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| Mesalamine-d3 C7H4NO3D3 M.W. 156.16 M-173
 | | | N-Propionyl mesalamine C10H11NO4 M.W. 209.20 M-174
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| N-Acetyl -4-aminosalicyclic Aci C9H9NO4 M.W. 195.18 M-175
 | | | Mupirocin Lithium CAS No. 12650-69-0 C26H43O9.Li M.W. 506.57 M-181
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| Mecoprop-d3 CAS No. 352431-15-3 C10H8ClO3D3 M.W. 217.67 M-191
 | | | Metolachlor-d6 CAS No. 51218-45-2 C15H16ClNO2D6 M.W. 289.83 M-201
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| Minoxidil-d10 CAS No. 38304-91-5 C9H5N5OD10 M.W. 219.31 M-211
 | | | Misoprostol acid C21H36O5 M.W. 368.52 M-231
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| Misoprostol acid-d5 C21H31D5O5 M.W. 373.52 M-232
 | | | Methadone-d3 CAS No. 76-99-3 (non-d) C21H24NOD3 M.W. 312.47 M-241
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| Methylphenidate-d3 CAS No. 113-45-1 (non-d) C14H16NO2D3 M.W. 236.33 M-251
 | | | R-Manidipine C35H38N4O6 M.W. 610.72 M-261
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| R-Manidipine-d4 C35H34N4O6D4 M.W. 614.74 M-262
 | | | S-Manidipine C35H38N4O6 M.W. 610.72 M-263
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| S-Manidipine-d4 C35H34N4O6D4 M.W. 614.74 M-264
 | | | Moxifloxacin CAS No. 151096-09-2 C21H24FN3O4 M.W. 401.44 M-271
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| Moxifloxacin-d4 HCl CAS No. 151096-09-2 (non-d) C21H20FN3O4D4.HCl M.W. 405.47 36.46 M-272
 | | | Moxifloxacin acyl sulfate C21H24FN3O7S M.W. 481.50 M-273
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| Moxifloxacin N-sulfate C21H24FN3O7S M.W. 481.50 M-274
 | | | Moxifloxacin acyl glucuronide C27H32FN3O10 M.W. 577.57 M-275
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| Bromomethlenediphosphonic Acid CAS No. 10596-21-1 CH3BrO6P2 M.W. 252.88 M-281
 | | | Difluoromethlenediphosphonic Acid CAS No. 10596-32-4 CH2F2O6P2 M.W. 209.97 M-282
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| Mifepristone CAS No. 84371-65-3 C29H35NO2 M.W. 429.61 M-291
 | | | Mifepristone-d3 CAS No. 84371-65-3 (non-d) C29H32NO2D3 M.W. 432.63 M-292
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| N-Desmethyl Mifepristone CAS No. 104004-96-8 C28H33NO2 M.W. 415.58 M-293
 | | | N-Didesmethyl Mifepristone CAS No. 104004-92-4 C27H31NO2 M.W. 401.55 M-294
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| Hydroxy Mifepristone CAS No. 105012-15-5 C29H35NO3 M.W. 445.61 M-295
 | | | Montelukast sodium CAS No. 151767-02-1 C35H35ClNO3S.Na M.W. 585.19 22.99 M-301
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| Montelukast-d6 sodium CAS No. 151767-02-1 (non-d) C35H29ClNO3SD6.Na M.W. 591.25 22.99 M-302
 | | | Montelukast sulfoxide sodium C35H35ClNO4S.Na M.W. 601.19 22.99 M-303
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| Montelukast-acyl-β-D-glucuronide C42H46ClNO8S M.W. 760.35 M-304
 | | | Moexipril CAS No. 103775-10-6 C27H34N2O7 M.W. 498.58 M-311
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| Moexipril-d5 CAS No. 103775-10-6 (non-d) C27H29N2O7D5 M.W. 503.61 M-312
 | | | Moexiprilat-d5 C25H25N2O7D5 M.W. 475.56 M-313
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| Moexiprilat C25H30N2O7 M.W. 470.53 M-314
 | | | Moexipril Acyl Glucuronide C31H38N2O13 M.W. 646.65 M-315
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| Mirodenafil CAS No. 862189-95-5 C26H37N5O5S M.W. 531.68 M-321
 | | | Modafinil CAS No. 68693-11-8 C15H15NO2S M.W. 273.36 M-331
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| Modafinil-d5 CAS No. 68693-11-8 (non-d) C15H10NO2SD5 M.W. 278.39 M-332
 | | | Modafinil acid CAS No. 63547-24-0 C15H14O3S M.W. 274.34 M-333
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| (R)-Modanifil acid CAS No. 112111-45-2 C15H14O3S M.W. 274.34 M-334
 | | | S-Modafinil C15H15NO2S M.W. 273.36 M-335
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| R-Modafinil C15H15NO2S M.W. 273.36 M-336
 | | | Modafinil sulfone C15H15NO3S M.W. 289.36 M-337
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| Modafinil-d5 Acid C15H9O3SD5 M.W. 1115-065A3 M-338
 | | | (R)-(-)-Modafinil-d5 Acid C15H9O3SD5 M.W. 279.37 M-339
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| (S)-(+)-Modafinil-d5 Acid C15H9O3SD5 M.W. 279.37 M-340
 | | | Minocycline-D6 CAS No. 10118-90-8 (non-d) C23H21N3O7D6 M.W. 463.52 M-341
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| (R)-(-)-Modafinil-d5 C15H10NO2SD5 M.W. 278.39 M-3410
 | | | (S)-(+)-Modafinil-d5 C15H10NO2SD5 M.W. 278.39 M-3411
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| (S)-(+)-Modafinil Acid C15H16O3S M.W. 274.34 M-3412
 | | | Modafinil-d5 Sulfone C15H10NO3SD5 M.W. 294.39 M-3413
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| Modafinil Acid Sulfone C15H14O4S M.W. 290.34 M-3414
 | | | Modafinil-d5 Acid Sulfone C15H9O4SD5 M.W. 295.37 M-3415
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| Minocycline-13C-d3 CAS No. 10118-90-8 (non-d) C23H24N3O7D3 M.W. 461.49 M-342
 | | | 6-Methoxy-2-naphthylacetic acid (6-MNA) C13H12O3 M.W. 216.24 M-351
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| 6-Methoxy-2-naphthylacetic acid (6-MNA)-13C-d3 C13H9O3D3 M.W. 220.25 M-352
 | | | 6-Methoxy-2-naphthylacetic acid (6-MNA) sulfate C13H12O6S M.W. 296.30 M-353
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| 6-Methoxy-2-naphthylacetic acid (6-MNA) glucuronide C19H20O9 M.W. 392.37 M-354
 | | | Metopimazine CAS No. 14008-44-7 C22H27N3O3S2 M.W. 445.61 M-361
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| Metopimazine-d6 CAS No. 14008-44-7 (non-d) C22H21N3O3S2D6 M.W. 451.64 M-362
 | | | Metopimazine acid C22H26N2O4S2 M.W. 446.59 M-363
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| Metopimazine acid-d6 C22H20N2O4S2D6 M.W. 452.63 M-364
 | | | 6-Desmethyl Moxonidine C8H10ClN5O M.W. 227.65 M-371
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| Moxonidine CAS No. 75438-57-2 C9H12ClN5O M.W. 241.6 M-372
 | | | Moxonidine-d3 CAS No. 75438-57-2 (non-d) C9H9ClN5OD3 M.W. 244.72 M-373
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| Memantine HCl C12H21N.HCl M.W. 179.31 36.46 M-381
 | | | MPP-d3 Iodide (1-methyl-4-phenylpyridinium-d3 iodide) C12H9ND3.I M.W. 173.25 126.90 M-391
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| Meclizine CAS No. 569-65-3 C25H27ClN2 M.W. 390.96 M-401
 | | | Meclizine-d8 CAS No. 569-65-3 (non-d) C25H19ClN2D8 M.W. 398.99 M-402
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| Meclizine N-Oxide (N4-oxide) C25H27ClN2O M.W. 406.96 M-403
 | | | Meclizine N-Oxide (N1-oxide) C25H27ClN2O M.W. 406.96 M-404
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| Meclizine N-Oxide (N, N'-dioxide) C25H27ClN2O2 M.W. 422.96 M-405
 | | | Meclizine-d8 dihydrochloride C25H19ClN2D8.2 HCl M.W. 399.01 2 36.46 M-406
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| Milnacipran Hydrochloride CAS No. 101152-94-7 C15H22N2O.HCl M.W. 246.36 36.46 M-411
 | | | Milnacipran CAS No. 92623-85-3 C15H22N2O M.W. 246.36 M-412
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| Milnacipran-d10 CAS No. 92623-85-3 (non-d) C15H12N2OD10 M.W. 256.42 M-413
 | | | L-Milnacipran C15H22N2O M.W. 246.36 M-414
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| D-Milnacipran C15H22N2O M.W. 246.36 M-415
 | | | Milnacipran-d5 HCl C15H17N2OD5.HCl M.W. 251.39 36.46 M-416
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| Metformin-d6 HCl CAS No. 657-24-9 (non-d) C4H5N5D6.HCl M.W. 135.20 36.46 M-421
 | | | Meprobamate CAS No. 57-53-4 C9H18N2O4 M.W. 218.25 M-431
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| Meprobamate-d3 CAS No. 57-53-4 (non-d) C9H15N2O4D3 M.W. 221.27 M-432
 | | | Meprobamate-N-glucuronide C15H26N2O10 M.W. 394.38 M-433
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| Methimazole-d3 CAS No. 60-56-0 (non-d) C4H3N2SD3 M.W. 117.19 M-441
 | | | Medroxyprogesterone acetate CAS No. 520-85-4 C24H34O4 M.W. 386.54 M-451
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| Medroxyprogesterone acetate-13C2-d3 CAS No. 520-85-4 (non-d) C24H31O4D3 M.W. 391.54 M-452
 | | | Medroxyprogesterone acetate-d10 CAS No. 520-85-4 (non-d) C24H24O4D10 M.W. 396.54 M-453
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| Midazolam C18H13ClFN3 M.W. 325.78 M-461
 | | | DL-Methionine C5H11NO2S M.W. 149.21 M-471
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| Methyl 4-Acetamido-5-Bromo-2-Methoxybenzoate C11H12BrNO4 M.W. 302.13 M-481
 | | | Mebeverine C25H35NO5 M.W. 429.56 M-491
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| Mebeverine-d6 C25H29NO5D6 M.W. 435.62 M-492
 | | | Desmethyl Mebeverine acid C16H25NO3 M.W. 279.38 M-493
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| Desmethyl Mebeverine acid-d5 C16H20NO3D5 M.W. 284.42 M-494
 | | | Mebeverine alcohol (MAL) C16H27NO2 M.W. 265.4 M-495
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| Mebeverine Acid HCl C16H25NO3.HCl M.W. 279.38 36.46 M-496
 | | | Mitiglinide CAS No. 145375-43-5 C19H25NO3 M.W. 315.42 M-501
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| Mitiglinide-d5 CAS No. 145375-43-5 (non-labelled) C19H20NO3D5 M.W. 320.45 M-502
 | | | Mitiglinide acyl glucuronide C25H33NO9 M.W. 491.54 M-503
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| Mildronate-d3 C6H11N2O2D3 M.W. 149.21 M-511
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