prov:value
| - R3, R4, R5 and R6 each can be for example hydrogen, methyl, ethyl, propyl, isopropyl, butyl, sec, butyl or amyl, or R3 and R5 can be halogen and R4 and R6 hydrogen, cyclopentyl, cyclohexyl, phenyl or benzyl or R4 and R6 together can be ethylene, propylene or butylene, i.e. form a 5 to 7 member ring with the two nitrogen atoms and the carbon atom of the isothiuronium group.
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