Disclosed herein is at least one compound chosen from compounds of leuco type of formula (I), dyes of azomethine type comprising a pyrazolopyridine unit of formula (II) corresponding to the compounds of formula (I), mesomeric forms, isomeric and tautomeric forms thereof, acid-addition salts thereof and solvates thereof:
本发明涉及公式(I)的
亚胺型
染料,包括与公式(I)相对应的含有
吡唑吡啶基团的
偶氮甲烷型
染料的至少一种化合物,其介质式具有共振式、异构体和互变异构体形式,以及其酸加成盐和溶剂化物。