prov:value
| - Cl, Br or especially 1), --S(C1 -C4 alkyl), a 5- or 6-membered heterocyclic ring, such as, in particular, indole or imidazole, --NH--C(NH)--NH2, phenoxyphenyl (unsubstituted or substituted by, for example, --OH or halogen, such as Cl, Br or especially I), an olefinic group, such as methylene or vinyl, and CO--NH--C(NH)--NH2.
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