101921 ⎘
Dyes with an anthracene nucleus condensed with one or more heterocyclic rings with or without carbocyclic rings the heterocyclic rings being only condensed with an anthraquinone nucleus in 1-2 or 2-3 position; Azines of the anthracene series; Para-diazines; Bis-anthraquinonediazines (indanthrone) Preparation from starting materials already containing the indanthrene nucleus
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