title: An unusual acid: (+/-)-3-benzoyl-1,2-dimethyl-8a-phenyl-2-benzothieno[2,3-b]pyrrole-1,2-dicarboxylic anhydride.
abstract: The title compound, C27H21NO4S, is a 2-benzothieno[2,3-b]pyrrole derivative with several substituents, present in the crystal as a racemate. The tetracyclic fused-ring system shows a 'U-shaped' molecular architecture, since the two rings flanking the central pyrrolidine ring both point in the same direction.
authors.affiliation: Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Universitá degli Studi di Messina, Via Salita Sperone 31, 98166 Vill. S. Agata-Messina, Italy. gbruno@unime.it
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Bruno
authors.forename: Francesco
authors.initials: F
authors.lastname: Nicoló
authors.forename: Archimede
authors.initials: A
authors.lastname: Rotondo
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Cordaro
authors.forename: Francesco
authors.initials: F
authors.lastname: Risitano
authors.forename: Giovanni
authors.initials: G
authors.lastname: Grassi