title: Marchantin A trimethyl ether: its molecular structure and tubocurarine-like skeletal muscle relaxation activity.
abstract: Marchantin A is a novel macrocyclic bis(bibenzyl)ether isolated from the liverwort Marchantia species. An X-ray study of its derivative, marchantin A trimethyl ether, revealed that the molecule possesses convex and concave surfaces, with a central hole on the concave surface. The centroid-centroid separations of opposing benzene rings are 8.80 and 4.55 A. A pharmacological study showed that the skeletal muscle relaxation activity is about 3.5 times less potent than that of d-tubocurarine. A comparison of the X-ray structure of marchantin A trimethyl ether and that of O,O',N-trimethyltubocurarine reported by Sobell et al. revealed that the molecules share almost the same macrocyclic bis(bibenzyl)ether skeleton structure, portions of which may therefore be crucial for the skeletal muscle relaxation activity.
authors.affiliation: Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Japan.
authors.forename: Z
authors.initials: Z
authors.lastname: Taira
authors.forename: M
authors.initials: M
authors.lastname: Takei
authors.forename: K
authors.initials: K
authors.lastname: Endo
authors.forename: T
authors.initials: T
authors.lastname: Hashimoto
authors.forename: Y
authors.initials: Y
authors.lastname: Sakiya
authors.forename: Y
authors.initials: Y
authors.lastname: Asakawa
mesh_terms: D000818:Animals; D001632:Bibenzyls / Q000737:chemistry / Q000494:pharmacology*; D018360:Crystallography, X-Ray; D004988:Ethers, Cyclic / Q000737:chemistry / Q000494:pharmacology*; D066298:In Vitro Techniques; D009125:Muscle Relaxants, Central / Q000494:pharmacology*; D009126:Muscle Relaxation / Q000187:drug effects; D009132:Muscles / Q000187:drug effects; D011898:Ranidae; D014403:Tubocurarine / Q000494:pharmacology*
chemical_list: D001632:Bibenzyls; D004988:Ethers, Cyclic; D009125:Muscle Relaxants, Central; C086238:marchantin A trimethyl ether; D014403:Tubocurarine