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Synthetic route of fluorescent monomers. BHHNA—4-bromo-N-(2-hydroxy-1-hydroxymethylethyl)-1,8-naphthalimide; MHHNA—4-methoxyl-N-(2-hydroxy-1-hydroxymethylethyl)-1,8-naphthalimide; DHHNA—4-diethylamino-N-(2-hydroxy-1-hydroxymethylethyl)-1,8-naphthalimide.
