title: Crystal structure of 3,13-dimethoxy-5,6,10,11-tetrahydrofuro[3,4-i][5]helicene-7,9-dione.
abstract: The title compound, C26H20O5, crystallizes with two independent molecules (A and B) in the asymmetric unit, which differ primarily in the location of the -OCH3 groups. In the crystal, the mol-ecules form a layered structure parallel to (10-1) by C-H⋯O hydrogen-bonded networks. Adjacent layers are also linked by further C-H⋯O hydrogen bonds, forming a three-dimensional structure.
authors.affiliation: National Metal and Materials Technology Center (MTEC), 114 Thailand Science, Park, Paholyothin Rd., Klong Luang, Pathumthani, 12120, Thailand.
authors.forename: Thanasat
authors.initials: T
authors.lastname: Sooksimuang
authors.affiliation: National Metal and Materials Technology Center (MTEC), 114 Thailand Science, Park, Paholyothin Rd., Klong Luang, Pathumthani, 12120, Thailand.
authors.forename: Siriporn
authors.initials: S
authors.lastname: Kamtonwong
authors.affiliation: National Metal and Materials Technology Center (MTEC), 114 Thailand Science, Park, Paholyothin Rd., Klong Luang, Pathumthani, 12120, Thailand.
authors.forename: Waraporn
authors.initials: W
authors.lastname: Parnchan
authors.affiliation: National Metal and Materials Technology Center (MTEC), 114 Thailand Science, Park, Paholyothin Rd., Klong Luang, Pathumthani, 12120, Thailand.
authors.forename: Laongdao
authors.initials: L
authors.lastname: Kangkaew
authors.affiliation: National Metal and Materials Technology Center (MTEC), 114 Thailand Science, Park, Paholyothin Rd., Klong Luang, Pathumthani, 12120, Thailand.
authors.forename: Somboon
authors.initials: S
authors.lastname: Sahasithiwat
keywords: crystal structure; helicene; hydrogen bonds