@article{articledcadd60b,
title   = {Structures of sulfur analogues of precocenes i.2,2,6-trimethyl-2h-1-benzothiopyran 1,1-dioxide},
author = {Castellano, Eduardo Ernesto and De Simone, C A and Zukerman-Schpector, Júlio and Ferreira, J T B and Catani, V},
year = {1989},
journal   = {Acta Crystallographica C}
}