Biochemistry and Molecular Biology of Antimicrobial Drug Action by Trevor J. Franklin
The subject is one of major interest in basic microbiology and infectious diseases and the book is a known classic.
From the reviews of the sixth edition:
"This sixth edition builds on the successful formula of its predecessors with an accessible small format, clear diagrams and illustrations, key antibiotic structures and an engaging explanatory text. … the great strength ... is that it has managed to convey the essentials of the topic without … expanding in girth at each edition. … this book remains the first port of call for those requiring an overview of the topic or seeking a starting point for more in-depth information on an unfamiliar antimicrobial." (Jonathan H Cove, British Toxicology Society Newsletter, Winter, 2005)