In pursuing the study of the antimicrobial properties of alkaloids prepared from Cuban plants the activity of 10 indol alkaloids and 4 semisynthetic variables obtained from three plants--Catharanthus roseus G. Don., Vallesia antillana Wood and Ervatamia coronaria Staph, of the family
Eleven monomeric indole alkaloids have been isolated from the roots of Ervatamia hainanensis. Nine of them are known: coronaridine 1, coronaridine hydroxyindolenine 2, heyneanine 3, vobasine 4, perivine 5, ibogamine 6, geissoschizol 7, 10-hydroxygeissoschizol 8 and 3-oxocoronaridine 9; and two are