Drug-like inactive molecules

 Dear Roger,
 from my point of view, the "most drug-like" inactive molecules should
 be the
 molecules listed in the WDI or in similar drug collections. There should be at
 least one or several biological target/s for every member at which the
 respective "drug" is inactive.
 Another good source might be the literature. There are thousands of publications
 where active, less active and even inactive analogs are listed with their
 quantitative data. So what?
 Best regards