FIELD: chemistry.SUBSTANCE: invention relates to compounds of formula (I) where "----" denotes a bond or is absent; R1 is a C1-4alkoxy group or halogen; R1b is H or C1-3alkyl; U and V each independently denote CH or N; W is CH or N, or, if "----" is absent, W is CH2 or NH; under the condition that at least one of U, V and W is CH or CH2; A is -CH2-CH(R2)-B-NH-* or -CH(R3)-CH2-N(R4)-[CH2]m-*; where asterisks indicate a bond which binds said fragments through a CH2-group with an oxazolidinone fragment; B is CH2 or CO; and R2 is hydrogen, OH or NH2; R3 and R4 both denote hydrogen, or R3 and R4 together form a methylene bridge; m equals 0, 1 or 2; and G is a phenyl which is monosubstituted in position 3 or 4, or disubstituted in positions 3 and 4, where each substitute is independently selected from a group comprising C1-4alkyl, C1-3alkoxy group and halogen; or G is a group selected from groups G1 and G5 where M is CH or N; Q' is S or O; Z1 is N, Z2 is CH and Z3 is CH; or Z1 is CH, Z2 is N and Z3 is CH or N; or Z1 is CH, Z2 is CR5 and Z3 is CH; or Z1 is CH, Z2 is CH and Z3 is N; and R5 is hydrogen or fluorine; or a pharmaceutically acceptable salt thereof. The compound of formula (I) or a pharmaceutically acceptable salt thereof are used as a medicinal agent for preventing or treating bacterial infections.EFFECT: oxazolidinone derivatives used as antimicrobial agents.15 cl, 2 tbl, 44 exИзобретение относится к соединениям формулы (I), где "----" обозначает связь или отсутствует; R1 представляет собой С1-4алкоксигруппу или галоген; R1b представляет собой Н или C1-3алкил; U и V каждый независимо представляет собой СН или N; W представляет собой СН или N, или, в случае, когда "----" отсутствует, W представляет собой СН2 или NH; при условии, что по крайней мере один из U, V и W представляет собой СН или CH2; А представляет собой -CH2-СH(R2)-В-NН-* или -СH(R3)-СН2-N(R4)-[CH2]m-*, где звездочки указывают на связь, которая через СН2-группу соединяет их с оксазолидиноновым фр