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Lee S K, Hughes D C, Schröder R. "Method for the Synthesis of 8-(2,4-Dihydroxyphenyl)-7-hydroxy-2-(2-hydroxy-4-oxocyclohexa-2,5-dien-1-ylidene)-2H-phenoxazin-3(10H)-one" [P]. US Patent, US 10040940 B2, 2015-06-24.
Park J H, Fischer A B, Yamamoto T. "A Process for Preparing High-Purity 8-(2,4-Dihydroxyphenyl)-7-hydroxy-2-(2-hydroxy-4-oxocyclohexa-2,5-dien-1-ylidene)-2H-phenoxazin-3(10H)-one" [P]. US Patent, US 11265175 B2, 2016-10-20.
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