Patent ID: 8288423

Claim:
An oxazolidinone derivative with a cyclic amidine, represented by Chemical Formula (1), or optical isomers and pharmaceutically acceptable salts thereof: wherein, A is selected from the following structures: X represents hydrogen or halogen; Y represents halogen; R 1 and R 2 independently represent hydrogen, (C 1 -C 7 )alkyl, (C 3 -C 12 )cycloalkyl, a 5- to 7-membered heterocycloalkyl containing one or more heteroatom(s) selected from N, O and S, (C 1 -C 7 )alkyl containing one or more heteroatom(s) selected from N, O and S, (C 6 -C 12 )aryl, (C 4 -C 12 )heteroaryl, â€”(CR 11 R 12 ) m COâ€”R 13 , â€”(CR 11 R 12 ) m SO 2 â€”R 14 or â€”(CR 11 R 12 ) m CR 21 â•CR 22 R 23 ; and the alkyl, cycloalkyl, aryl or heteroaryl of R 1 and R 2 may be further substituted by one or more substituent(s) selected from (C 1 -C 7 )alkyl, halo(C 1 -C 7 )alkyl, (C 1 -C 7 )alkoxy and halogen; R 11 and R 12 independently represent hydrogen or (C 1 -C 7 )alkyl, or they may be linked via (C 2 -C 5 )alkylene to form a ring; R 13 and R 14 independently represent hydrogen, (C 1 -C 7 )alkyl or (C 1 -C 7 )alkoxy; R 21 through R 23 independently represent hydrogen or (C 1 -C 7 )alkyl, m represents an integer from 0 to 3; and n represents an integer from 1 to 3.