Seven alkaloids have been isolated from the leaves of Buxus balearica Lam: alkaloid A (apparently identical with baleabuxine), C30H50N2O2; alkaloid B (possibly N-isobutyrylbaleabuxidienine F), C30H50N2O3; alkaloid C (new), C26H41NO, with a C=C-C=O grouping and a N(CH3)2 group; alkaloid D, C30H50N2O4; alkaloid E (new), C27H50N2O3; alkaloid F (possibly identical with cyclomicrophylline B), C27H46N2O2; and alkaloid G (new), C27H46N2O3. © 1971 Consultants Bureau.