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:
本文所披露的至少一种化合物是选择自式(I)的白色化合物,以及包含式(II)的
吡唉
吡啶单元的
偶氮甲烷型
染料,其对应于式(I)的化合物,还包括共振式、同分异构体和互变异构体形式,其酸加成盐和溶剂化合物。