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| (6s)-5,6,7,8-Tetrahydrofolate | | |
| 1,2,4-Triazole-Carboxamidine | | |
| 2,4-Diamino-6-Phenyl-5,6,7,8,-Tetrahydropteridine | | |
| 2-Aminothiazoline | | |
| 5,6-Cyclic-Tetrahydropteridine | | |
| 6s-5,6,7,8-Tetrahydrobiopterin | | |
| 7,8-Dihydro-L-Biopterin | | |
| 7-Nitroindazole | | |
| Adma | | |
| Aminoguanidine | | |
| Ethylisothiourea | | |
| L-2-Amino-4-(Guanidinooxy)Butyric Acid | | |
| L-Homoarginine | | |
| L-Thiocitrulline | | |
| N-(Chlorophenyl)-N'-Hydroxyguanidine | | |
| N1,N14-Bis((S-Methyl)Isothioureido)Tetradecane | | |
| N5-Iminoethyl-L-Ornithine | | |
| S-Ethylisothiourea | | |
| S-Isopropyl-Isothiourea | | |
| Se-Ethyl-Isoselenourea | | |
| Thiocoumarin | | |