From the trunk bark of Strychnos brasiliensis (Spreng.) Mart., spermostrychnine (I) and six new indoline alkaloids have been isolated and their structures and configurations determined. They were named: 12-hydroxy-11-methoxyspermostrychnine (II), strychnobrasiline (III), 12-hydroxy-11-methoxystrychnobrasiline (IV), 10,11-dimethoxystrychnobrasiline (V), strychnosilidine (VI), and strychnosiline (VII). © 1971.