title: Benzo[i]naphtho[c,d]bicyclo[5.4.1]dodecan-12-one.
abstract: In the title compound, pentacyclo[11.8.1.1(3,11).0(7,23).0(15, 20)]tricosa-3,5,7,9,11(23),15,17,19-octaen-22-one, C(23)H(20)O, the bicyclo[5.4.1]dodecan-12-one moiety takes a rigid conformation in which the seven- and eight-membered rings take chair and boat-boat forms, respectively. The molecule has a non-crystallographic mirror symmetry perpendicular to the benzene and naphthalene planes.
authors.affiliation: Graduate School of Engineering Sciences, 39, Kyushu University, Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan.
authors.forename: S I
authors.initials: SI
authors.lastname: Isobe
authors.forename: K
authors.initials: K
authors.lastname: Kubo
authors.forename: T
authors.initials: T
authors.lastname: Thiemann
authors.forename: T
authors.initials: T
authors.lastname: Sawada
authors.forename: T
authors.initials: T
authors.lastname: Yonemitsu
authors.forename: S
authors.initials: S
authors.lastname: Mataka