| JNJ-63533054, [-3H]- | MT 2172 |
| Kaempferide, [6,8,3',5'-3H(N)]- | MT 1562 |
| Kaempferol, [3H]- | MT 951 |
| 2-Ketoglutaric acid, sodium salt, [14C(U)]- Discontinued | MC 2669 |
| 2-Keto glutaric acid, sodium salt, [5-14C]- (40-60 mCi/mmol) Discontinued | MC 1393 |
| 2-Keto glutaric acid, sodium salt, [5-14C]- (20-40 mCi/mmol) Discontinued | MC 1393L |
| 2-Ketoisocaproic acid, [1-14C]- | MC 2338 |
| Kukoamine B, methanesulfonic acid salt, [1,4-butylamino-14C1]- | MC 2438 |
| Kynurenic acid, [6-3H(N)]- | MT 2011 |
| Kynurenine, [5-3H]- | MT 2009 |