| Baclofen, [3H]- | MT 2105 |
| Barium acetate, [acetate-1-14C]- | MC 2814 |
| Barium carbide, [14C]- Discontinued | MC 1246 |
| Barium carbonate, [14C]- Discontinued | MC 136 |
| Barium cyanamide, [14C]- | MC 224 |
| BCH-189, [5-3H(N)]- Discontinued | MT 646 |
| BCNU, [chloroethyl-2-14C]- Discontinued | MC 1448 |
| BE2012, [3H]- | MT 2152 |
| BE2016, [3H]- | MT 2151 |
| Benadryl, [phenyl-14C(U)]- | MC 2158 |
| Bendamustine, hydrochloride, [benzoimidazole-2-14C]- | MC 2679 |
| Benserazide hydrochloride, [benzyl-14C]- | MC 2626 |
| Bensulfuron methyl, [phenyl-14C]- | MC 2583 |
| Bensulfuron methyl, [pyrimidine-2-14C]- | MC 2578 |
| Benzaldehyde, [carbonyl-14C]- Discontinued | MC 295 |
| 2-Benzamido-4-methoxy-4-oxobutanoic acid, [3H]- | MT 1661 |
| Benzanthrone, [3H]- | MT 1696 |
| Benzbromarone, [3H]- | MT 2028 |
| Benzene, [14C]- | MC 118 |
| Benzene, [3H]- | MT 1573 |
| Benzimidazolone A, [3H]- | MT 1995 |
| Benznidazole, [14C]- | MC 2615 |
| Benzobicyclon, [bicyclooctane ring-2,4-14C(U)]- | MC 2524 |
| Benzobicyclon, [chlorophenyl-14C(U)]- | MC 2523 |
| Benzocaine, [ring-14C(U)]- | MC 1105 |
| Benzo[k]fluoranthene, [7,12-14C]- | MC 2036 |
| 2-(2-Benzofuranyl)-2-imidazoline, [4,6-3H]- | MT 1911 |
| Benzoic acid, [carboxy-14C]- | MC 290 |
| Benzoic acid, [ring-14C(U)]- | MC 1252 |
| Benzoic acid, [ring-14C(U)]- | MC 1252S |
| Benzoic acid, [ring-D5, 99%]- | MD 102 |
| Benzoic acid, free acid, [3H]- | MT 1882 |
| Benzoic acid, sodium salt, [ring-14C(U)]- | MC 2319 |
| Benzoic acid N'-benzoyl-N,N'-dimethylhydrazine, [methyl-14C]- | MC 2093 |
| Benzo[b]phenanthro[2,3-d]thiophene, [3H]- | MT 1656 |
| 1,3-Dihydro-1-hydroxy-2,1-benzoxaborole-7-propanoic acid, [3-14C]- | MC 2777 |
| Benzoxazole, [phenyl ring-14C(U)]- | MC 2136 |
| Benzoyl adenine, [8-14C]- | MC 1378 |
| 4-Benzoylbenzoic acid, [ring-3H]- | MT 1613 |
| Benzoylecgonine, [benzoyl-3H]- | MT 579 |
| Benzoyl-L-phenylalanyl-L-alanyl-L-proline, [3H]- | MT 2182 |
| Benzoyl peroxide, [carbonyl-14C]- | MC 1437 |
| 4'-N-Benzoyl staurosporin, [3H]- | MT 1954 |
| 5-Benzylacyclouridine, [3H]- Discontinued | MT 611 |
| N6-Benzyladenine | M 1894 |
| N6-Benzyladenine, [8-14C]- | MC 190 |
| N6-Benzyladenine, [benzyl ring-14C(U)]- | MC 2302 |
| N6-Benzyladenosine, [3H]- | MT 557 |
| Benzyl alcohol, [7-14C]- | MC 478 |
| Benzylamine hydrochloride, [7-14C]- | MC 468 |
| Benzyl bromide, [7-14C]- | MC 2099 |
| Benzylchloride, [ring-14C(U)]- | MC 2385 |
| Benzyldimethyldodecylammonium chloride, [benzyl-14C]- | MC 2369 |
| Benzylguanine, [benzene-3H]- | MT 1915 |
| 6-Benzyl-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-4(3H)-one, [pyrimidine-2-14C]- | MC 2778 |
| Berberine iodide, [12-14C]- | MC 2531 |
| Berberine mangiferin salt, [berberine-12-14C]- | MC 2664 |
| Betaine, [methyl-14C]- | MC 2065 |
| Betamethasone dipropionate, [3H]- | MT 2093 |
| Betamethason-17-valerate, [1,2,4-3H]- | MT 2061 |
| Bevirimat, [3H]- | MT 1996 |
| BF 227, [3H]- | MT 2169 |
| 2-BFI, [4,6-3H]- | MT 1911 |
| Bicyclo[3.2.1]octan-2,4-dione, [2,4-14C]- | MC 2106 |
| Bifenazate, [14C]- | MC 2684 |
| Bilirubin, [3H]- | MT 1575 |
| Bimatoprost, [hept-5-enoyl-5,6-3H(N)]- | MT 1941 |
| Biochanin A, [4-14C]- | MC 421 |
| Biochanin A, [6,8,3',5'-3H(N)]- | MT 1563 |
| 6-Biopterin, [3H]- (2-Amino-4-hydroxy-6-[1,2-dihydroxypropyl]-pteridine, [3H]-) | MT 810 |
| d-Biotin, [thieno[3,4-d]imidazo-carbonyl-14C]- | MC 2345 |
| d-Biotin, [thieno[3,4-d]imidazo-carbonyl-14C]- | MC 2345L |
| Birinapant, [3H]- | MT 2131 |
| 4-[Bis(2-Chloroethyl)-amino]-L-phenylalanine, [chloroethyl-1,2-14C]- Discontinued | MC 248 |
| N,N'-Bis(2-chloroethyl)-N-nitrosourea, [chloroethyl-2-14C]- Discontinued | MC 1448 |
| Bis(2-chloro-1-methylethyl)ether, [ethyl-2-14C]- (DCIP, [ethyl-2-14C]-) | MC 2289 |
| 1,3-Bis(2,3-dichlorophenyl)urea, [urea-14C]- | MC 2815 |
| N,N'-Bis-(1,12-dodecyl)-picolinium bromide, [carbonyl-14C]- | MC 2312 |
| Bis(2-ethylhexyl-2H17)phthalate-2H4, [carbonyl-14C]- | MC 2561 |
| N,N-Bis(2-hydroxyethyl)-p-phenylenediamine, [ring-14C(U)]- | MC 2189 |
| (Z)-3-(3-(3,5-Bis(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)-N'-(pyrazin-2-yl)acrylohydrazide, [14C]- | MC 2792 |
| 9-[-(R)-[[(isopropoxycarbonyl)oxy]methoxy]phosphonyl]methoxy]ethyl] adenine fumarate Discontinued | M 1617 |
| 9-[-(R)-[[(isopropoxycarbonyl)oxy]methoxy]phosphonyl]methoxy]propyl] adenine fumarate, [adenine-8-14C]- | MC 2023 |
| Bisphenol A, [propyl-2-14C]- | MC 1401 |
| Bisphenol A, [ring-14C(U)]- | MC 2061 |
| Bisphenol A, [o-phenol-3H]- | MT 1551 |
| Bisphenol A bis(diphenyl phosphate), [phenyl-14C(U)]- | MC 2431 |
| Bisphenol AF, [ring-14C(U)]- | MC 2809 |
| Bisphenol S, [14C(U)]- | MC 2586 |
| Bis(pivaloyloxymethyl)-9-[2-(phosphonomethoxy)ethyl] adenine | M 1608 |
| Bis(pivaloyloxymethyl)-9-[2-(phosphonomethoxy)ethyl]-adenine, [adenine-8-14C]- | MC 2034 |
| Bis(pivaloyloxymethyl)-9-[2-(phosphonomethoxy)ethyl) adenine, [adenine-8-3H]- | MT 1608 |
| Bis(pivaloyloxymethyl)-9-[2-(phosphonomethoxy)propyl] adenine | M 1629 |
| Bis(pivaloyloxymethyl)-9-[2-(phosphonomethoxy)propyl] adenine, [adenine-2,8-3H]- | MT 1629 |
| Bis-POC-PMEA Discontinued | M 1617 |
| Bis-POC-PMPA | M 1725 |
| Bis-POC-PMPA, [adenine-8-14C]- | MC 2023 |
| Bis-POC-PMPA, [adenine-8-3H]- | MT 1725 |
| Bis POM PMEA | M 1608 |
| Bis POM PMEA, [adenine-8-14C]- | MC 2034 |
| Bis POM PMEA, [adenine-8-3H]- | MT 1608 |
| Bis POM PMPA | M 1629 |
| Bis POM PMPA, [adenine-2,8-3H]- | MT 1629 |
| Bis-POM PMPDAP, [diaminopurine-8-3H]- | MT 1691 |
| Bis(trimethylsilyl)acetylene, [acetylene-14C(U)]- | MC 2373 |
| Bitopertin, [methyl-3H]- | MT 2136 |
| BMS-189453, [3H]- | MT 2153 |
| BMS-986094, [naphthol-1-14C]- | MC 2766 |
| BMS-986094, [purine-8-14C]- | MC 2767 |
| Boc anhydride, [carbonyl-14C2]- | MC 2056 |
| N-t-BOC-L-alanine, [2,3-3H]- | MT 964 |
| N-t-BOC-Glycylalendronic acid, sodium salt, [alendronate-4-14C]- | MC 2166 |
| N-Boc-piperazine, [piperazine-14C(U)]- | MC 2479 |
| N-Boc-L-proline, [proline-1-14C]- | MC 2469 |
| Bosentan | M 1902 |
| Bosentan, [3H]- | MT 2071 |
| 7-(S)-Brefeldin A, [7-3H]- | MT 966 |
| Bremelanotide, [D-Phe-ring-14C(U)]- | MC 2711 |
| Brigatinib, [14C]- | MC 2741 |
| Brilliant Blue FCF, [aniline-14C(U)]- | MC 2342 |
| Brinzolamide, [3H]- | MT 2063 |
| Bromoacetic acid, [1-14C]- | MC 188 |
| Bromoacetic acid, [2-14C]- | MC 1257 |
| 8-Bromoadenosine | M 1792 |
| Bromobenzene, [14C(U)]- | MC 1262 |
| Bromobenzene, [14C(U)]- | MC 1262H |
| 4-Bromobenzoic acid, [carboxyl-14C]- | MC 2546 |
| 5-Bromocytidine | M 1789 |
| 8-Bromo-2'-deoxyadenosine | M 1758 |
| 5-Bromo-2'-deoxycytidine | M 1755 |
| 8-Bromo-2'-deoxyguanosine | M 1754 |
| 5-Bromo-2'-deoxyuridine | M 1753 |
| 5-Bromo 2'-deoxyuridine, [2-14C]- | MC 115 |
| 5-Bromo 2'-deoxyuridine, [6-3H]- | MT 637 |
| 5-Bromodeoxyuridine 5'-monophosphate, diammonium salt, [6-3H]- | MT 681 |
| 5-Bromo-2'-deoxyuridine-5'-monophosphate sodium salt | M 1934 |
| 4-Bromo-N,N-dimethylaniline, [ring-14C(U)]- | MC 2381 |
| (2-Bromoethyl)trimethylammonium bromide, [ethyl-1,2-14C]- | MC 2046 |
| 3-Bromo-4-fluorobenzaldehyde, [ring-14C(U)]- | MC 2489 |
| 8-Bromoguanosine | M 1793 |
| 8-Bromoguanosine, [8-14C]- | MC 221 |
| 6-Bromohexanoic acid, [1-14C]- | MC 474 |
| 5-Bromo-2-methoxybenzaldehyde, [carbonyl-14C]- | MC 2693 |
| 2-Bromo-N-(4-methoxy-2-methylphenyl)-acetamide, [carbonyl-14C]- | MC 2135 |
| 4-(Bromomethyl) acetophenone, [carbonyl-14C]- | MC 2636 |
| 2-Bromo-5-methylpyridine, [2,6-14C]- | MC 2568 |
| 2-Bromonicotinic acid, [2-14C]- | MC 2165 |
| Bromonitromethane, [14C]- | MC 1428 |
| 2-Bromopalmitic acid, [1-14C]- | MC 451 |
| N-(4-Bromophenyl) acetamide, [phenyl-14C(U)]- | MC 2181 |
| 3-Bromopropionitrile, [nitrile-14C]- | MC 2517 |
| Bromopyruvic acid, [2-14C]- | MC 2326 |
| Bromosulfophthalein, [3H]- | MT 2079 |
| 4-Bromotoluene, [ring-14C(U)]- | MC 2595 |
| 5-Bromouracil, [2-14C]- | MC 116 |
| 5-Bromouracil, [6-3H]- | MT 629 |
| 5-Bromouridine | M 1791 |
| 5-Bromouridine, [2-14C]- | MC 169 |
| 5-Bromovinyl-2'-deoxyuridine, [2-14C]-; (Brivudine, [2-14C]-) | MC 2131 |
| 5-(Bromovinyl) 2'-deoxyuridine, [2'-3H]-; (Brivudine, [2'-3H]-) Discontinued | MT 963 |
| 5-(Bromovinyl) 2'-deoxyuridine, [5'-3H]-; (Brivudine, [5'-3H]-) | MT 1738 |
| 8-Bromoxanthine | M 1399 |
| 8-Bromoxanthine, [8-14C]- | MC 1399 |
| 4-tert-Bucinal, [3H]- | MT 1714 |
| Bupivacaine hydrochloride, [phenyl-14C(U)]- | MC 2581 |
| Bupivacaine hydrochloride, [3H]- | MT 1544 |
| 2,3-Butanedione, [2,3-14C]- | MC 2281 |
| 1,4-Butanediol diglycidyl ether, [butane-1-14C]- | MC 2537 |
| N-(tert Butoxycarbonyl)-L-alanine, [2,3-3H]- | MT 964 |
| n-Butyl alcohol, [1-3H]- | MT 1895 |
| tert-Butyl 4-acetylbenzoate, [ring-14C(U)]- | MC 2785 |
| t-Butyl alcohol, [14C(U)]- | MC 2033 |
| t-Butylamine, hydrochloride, [1-14C]- | MC 1206 |
| t-Butyl chloride, [methane-14C]- | MC 2565 |
| 4-t-Butyl cyclohexyl acetate, [acetate-1-14C]- | MC 2556 |
| n-Butylglycidyl ether, [butyl-1-14C]- (2-Butoxymethyl oxirane, [butoxy-1-14C]-) | MC 2269 |
| Butyric acid, sodium salt, [1-14C]- | MC 319 |
| Butyryl Coenzyme A, [butyryl-1-14C]- | MC 330 |
| N-tert-Butyl-alpha-phenylnitrone, [methylene-14C]- | MC 1444 |