This is sodium hydride, a strong base used in some glycosidation reactions.
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Acetic acid (2R,3S,4R,5R,6S)-3-acetoxy-2-acetoxymethyl-5-acetylamino-6-[2-methyl-4-(2-methyl-benzoyl)-phenoxy]-tetrahydro-pyran-4-yl ester
Benzophenone
SODIUM BOROHYDRIDE