FIELD: medicine, pharmaceutics.
SUBSTANCE: claimed are pyrocatechol derivatives of formula I 
where R stands for group of formulae Ia 
Ib 
Ic 
or Id 
R1 stands for 4-halogenbut-2-enyl, R2 stands for lower alkyl or cycloalkyl, R3 stands for lower alkyloxy group and R4 stands for lower alkyloxy-lower alkyloxy group, or, when R represents group of formula (Ia), R4 stands for hydroxy group, hydroxy-lower alkyloxy group or group of formula Ie 
R5 stands for reaction ester hydroxy group, R6 stands for azido group and R7 stands for lower alkyl, lower alkenyl, cycloalkyl or aryl-lower alkyl, and their salts, which are intermediate compounds in obtaining active ingredients of medications.
EFFECT: obtaining active ingredients of medications.
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