Patent ID: 8753794

Claim:
An N-acyl-β-lactam derivative represented by formula (1): wherein: R 1 represents a hydrogen atom, a methyl group, or a trifluoromethyl group; W represents an alkylene group having a carbon number of from 1 to 10 or a cycloalkylene group having a carbon number of from 4 to 10; n represents 1; and each of R 2 , R 3 , R 4 , and R 5 independently represents a hydrogen atom, an alkyl group having a carbon number of from 1 to 5, a cyclic hydrocarbon group having a carbon number of from 3 to 10, or an acyloxy group having a carbon number of from 2 to 6, wherein (1) R 2 and R 3 , or R 4 and R 5 , are optionally connected to each other to form a substituted or unsubstituted ring having a ring forming atom number of from 3 to 10, wherein said substituted or unsubstituted ring optionally comprises an oxygen atom; and (2) all of R 2 , R 3 , R 4 , and R 5 are not each a hydrogen atom at the same time.