Patent ID: 8859183

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, provided that R 3 and R 4 are connected to each other to form a substituted or unsubstituted ring 2) having a ring forming atom number of from 4 to 10, said ring 2) optionally comprising an oxygen atom.