SEARCH Articles Figures Tables 3- -butyrolactam 3- -butyrolactam A,/?-Unsaturated y-butyrolactams A,p-unsaturated y-butyrolactam A-methylene-y-butyrolactams Butyrolactam complexes Butyrolactames Butyrolactams formation Y-Butyrolactam Y-butyrolactame Y-butyrolactams