Thirteen alkaloids were isolated from the seeds of Strychnos nux-vomica. They were identified as strychnine, beta-colubrine, pseudostrychnine, strychnine N-oxide, brucime, brucine N-oxide, novacine, icajine, vomicine, isostrychnine, isobrucine, isobrucine N-oxide and isostrychnine N-oxide by