The active hydrogen in the compound (6) might take negative effect in some reactions and was substituted by a methyl to get compound (7) which was a new chiral guanidine.
化合物(6)上与氮相连的活泼氢原子，可能对某些反应有不利影响，故用碘甲烷对其进行甲基取代，得到了新的手性胍—化合物(7)，并做了表征。
Dyeing assistant RG, a cationic compound, has at least two reactive groups which are sensitive to active hydrogen.
助染剂RG是一种阳荷性的化合物。它至少含有两个能与活泼氢发生作用的活性基因。
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