title: Further alkaloids from Strychnos dolichothyrsa.
abstract: The isolation of one of the major alkaloids and 11 minor alkaloids from the stem bark of Strychnos dolichothyrsa is described. The major alkaloid was identified as bisnor-C-alkaloid H. Two new dimeric alkaloids derived from this alkaloid were found, dolichocurine and dolichothine. For the former alkaloid a structure is proposed. Furthermore, the following minor alkaloids were identified: bisnor-C-alkaloid H N-oxide and di-N-oxide, Wieland Gumlich aldehyde, 18-deoxy Wieland Gumlich aldehyde, 11-methoxy-diaboline, tubotaiwine, condylocarpine, nor-C-fluorocurarine and nor-macusine B. In the extracts of the stem bark of S. urceolata 11-methoxydiaboline was identified as one of the major alkaloids.
authors.affiliation: Department of Pharmacognosy, Gorlaeus Laboratories, Leiden, The Netherlands.
authors.forename: R
authors.initials: R
authors.lastname: Verpoorte
authors.forename: M J
authors.initials: MJ
authors.lastname: Verzijl
authors.forename: A B
authors.initials: AB
authors.lastname: Svendsen