[C:1]12[C:14](=[O:15])[O:13][C:11](=[O:12])[C:9]3=[C:10]1[C:5](=[CH:6][CH:7]=[CH:8]3)[CH:4]=[CH:3][CH:2]=2.P([O-])([O-])([O-])=O.[OH:21][NH3+:22].O[NH3+].O[NH3+]>O>[OH:21][N:22]=[C:14]([C:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][C:9]=2[C:11]([OH:13])=[O:12])[CH:4]=[CH:3][CH:2]=1)[OH:15]1.98 g (10.0 mmol) of 1,8-naphthalenedicarboxylic anhydride and 0.985 g (5.00 mmol) of hydroxylammonium phosphate were reacted with 2 ml of water analogously to Example 7 for 6 hours at a bath temperature of 130° C. Following cooling, the pale brown reaction mixture was digested with water, and the solid was filtered off with suction and dried. The yield was 1.89 g (89%).
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