CN([C@@H:4]1CC2C(=CC=CC=2)[C@H:5]1[OH:13])N.[C:14]([OH:21])(=[O:20])/[CH:15]=[CH:16]\[C:17]([OH:19])=[O:18].CC[OH:24]>CCOCC>[CH2:5]([OH:13])[CH2:4][O:18][C:17]([CH2:16][CH:15]([OH:24])[C:14]([OH:21])=[O:20])=[O:19](1R,2R)-2-(1-methylhydrazino)-1-indanol (1.45 g, 8.1 mmol, prepared from (1R,2R)-2-methylamino-1-indanol (1.63 g, 10 mmol) according to Example 1) was treated with an equivalent amount of maleic acid in a mixture of EtOH and Et2O to give crystalline hydrogenmaleate salt which was filtered off and recrystallized.
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