From the aerial parts of Delphinium fangshanense W.T, Wang, a new norditerpenoid alkaloid, 16-demethyldelsoline, and a new tetrahydrobenzylisoquinoline alkaloid, O-methylroefractine N-oxide, together with known alkaloids methylycaconitine, nudicauline, delavaine A, delavaine B and magnoflorine were obtained. Their structures were elucidated on the basis of 1-D and 2-D NMR spectroscopic techniques. (C) 1999 Elsevier Science Ltd. All rights reserved.