FIELD: chemistry.
SUBSTANCE: invention relates to a compound of formula I or its pharmaceutically acceptable salts, where grouping Het denotes a pyridinyl or thiazolyl; each of R1 and R2 represents H; each R3 and R4 independently denotes H, -C1-8alkyl or R3 and R4, taken together, form C3-6cycloalkyl; W represents -H, -PO(OH)2 or -CH2OPO(OH)2; each of X and Y denotes chlorine or each of X and Y denotes fluorine, and Z is H.
EFFECT: compounds of formula I are used in method of controlling and treating infections in livestock, which involves administering animal with therapeutically effective amount of compound of formula I or its pharmaceutically acceptable salt.
8 cl, 3 tbl, 161 ex
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