title: Crystal structure of tetra-ethyl 27,30-dioxo-7,12,20,25-tetra-tert-but-yl-3,16-dioxa-9,22,28,31-tetra-thia-hepta-cyclo-[21.3.1.1(1,5).1(4,8).1(10,14).1(14,18).1(17,21)]dotriaconta-4,6,8(29),10,12,17,19,21(32),23,25-deca-ene-2,2,15,15-tetra-carboxyl-ate.
abstract: The asymmetric unit of the title compound, C54H64O12S4, consists of one half of the mol-ecule, which is located on an inversion centre. The heterocyclic six-membered ring adopts a distorted envelope conformation with the spiro C atom as the flap. In the crystal, mol-ecules are linked by weak C-H⋯O hydrogen bonds with an R (2) 2(14) motif, forming a chain along the b-axis direction.
authors.affiliation: Department of Physics, Faculty of Sciences, Erciyes University, 38039 Kayseri, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Akkurt
authors.affiliation: Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA.
authors.forename: Jerry P
authors.initials: JP
authors.lastname: Jasinski
authors.affiliation: Chemistry and Environmental Division, Manchester Metropolitan University, Manchester M1 5GD, England ; Chemistry Department, Faculty of Science, Minia University, 61519 El-Minia, Egypt.
authors.forename: Shaaban K
authors.initials: SK
authors.lastname: Mohamed
authors.affiliation: Medical Laboratory Department, College of Science, Majmaah University, 11932, Saudi Arabia ; Chemistry Department, Faculty of Science, Sohag University, 82524 Sohag, Egypt.
authors.forename: Omran A
authors.initials: OA
authors.lastname: Omran
authors.affiliation: Kirkuk University, College of Science, Department of Chemistry, Kirkuk, Iraq.
authors.forename: Mustafa R
authors.initials: MR
authors.lastname: Albayati
keywords: calixarenes; crystal structure; hydrogen bonding; macrocycles