title: (1R,1'R,3S,3'S)-5,5',10,10'-Tetra-meth-oxy-1,1',3,3'-tetra-methyl-3,3',4,4'-tetra-hydro-1H,1'H-8,8'-bi[benzo[g]isochromene].
abstract: In the title compound, C(34)H(38)O(6), the methyl groups on each pyran ring exhibit 1,3-cis stereochemistry, established during synthesis by pseudo-axial delivery of hydride during a lactol reduction step. In the crystal structure, the mol-ecule lies on a twofold rotation axis and the torsion angle about the central diaryl bond is 41.3 (1)°. The mol-ecules pack in a herringbone arrangement.
authors.affiliation: Department of Chemistry, University of Auckland, Private Bag 92019, Auckland, New Zealand.
authors.forename: Jimmy J P
authors.initials: JJ
authors.lastname: Sejberg
authors.forename: Jonathan
authors.initials: J
authors.lastname: Sperry
authors.forename: Ka Wai
authors.initials: KW
authors.lastname: Choi
authors.forename: Peter D W
authors.initials: PD
authors.lastname: Boyd
authors.forename: Margaret A
authors.initials: MA
authors.lastname: Brimble