title: Two new protoberberine quaternary alkaloids from Corydalis yanhusuo.
abstract: Two new protoberberine quaternary alkaloids, 13-methyl-palmatrubine (1) and 13-methyl-dehydrocorydalmine (2), were isolated from the tubers of Corydalis yanhusuo W.T. Wang. 1 was isolated as a natural product for the first time, and 2 a new compound. Their structures were elucidated on the basis of spectroscopic evidence, especially 1D- and 2D-NMR experiments.
authors.affiliation: Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
authors.forename: Xing-Ye
authors.initials: XY
authors.lastname: Cheng
authors.forename: Yue
authors.initials: Y
authors.lastname: Shi
authors.forename: Shun-Liang
authors.initials: SL
authors.lastname: Zheng
authors.forename: Wen
authors.initials: W
authors.lastname: Jin
authors.forename: Hong
authors.initials: H
authors.lastname: Sun
mesh_terms: D001600:Berberine Alkaloids / Q000737:chemistry*; D031311:Corydalis / Q000737:chemistry*; D015394:Molecular Structure
chemical_list: C539139:13-methyl-dehydrocorydalmine; C539140:13-methyl-palmatrubine; D001600:Berberine Alkaloids; C009090:protoberberine