Osazone
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Osazones are a class of carbohydrate derivatives found in organic chemistry formed when sugars are reacted with phenylhydrazine. The famous German chemist Emil Fischer developed and used the reaction to identify sugars whose stereochemistry differed only at one chiral carbon. The reaction can also be used to identify natural sugars found in plant tissues.
I calculated the molecular weight of the osazone as 385 grams/mol, although it could be wrong.