Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... A rigid GABA analog has been prepared from the adduct obtained from the [4+3]-cycloaddition of pentachloroacetone and a 2-substituted furan. ... A rigid GABA analog was prepared from a cycloadduct obtained from a [4+3]-cycloaddition between a 2-substituted furan and the oxyallylic cation derived ...