FIELD: chemistry.
SUBSTANCE: method of obtaining compound of the formula 
VIII where R12 and R13 each are removable protective group where protective group R12 is more resistant to extraction by hydrolysis or hydration than R13. Method involves reaction of compound of the formula 
IX with relevant R12 donor compound selected out of anhydrides, halogenides, carbamates and N-hydroxysuccinimides.
EFFECT: improved method.
4 cl, 6 ex
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