B. Tofern et al., Bonaspectins and neobonaspectins, first sesquilignans and sesquineolignansfrom a convolvulaceous species, PHYTOCHEM, 53(1), 2000, pp. 119-128
Four new tetrahydrofuran-type sesquilignans, named bonaspectin A, bonaspect
in B, bonaspectin C 4 "-beta-glucoside and bonaspectin D 4 "-beta-glucoside
, as well as two new 8.O.4'-type sesquineolignans, named neobonaspectin A a
nd B. were isolated from the aerial vegetative parts of Bonamia spectabilis
(Convolvulaceae), together with the known compound rel-(7S,8S,7'R,8'R)-3,3
',4,4',5,5'-hexamethoxy-7.O.7',8.8'-lignan. Their structures were establish
ed on the basis of spectral data. (C) 2000 Elsevier Science Ltd. All rights
reserved.