Search results: URV_PC_Article.ParClauARPC.es:Heterocyclic AND URV_PC_Article.ParClauARPC.es:compounds, AND URV_PC_Article.ParClauARPC.es:4 AND URV_PC_Article.ParClauARPC.es:or AND URV_PC_Article.ParClauARPC.es:more AND URV_PC_Article.ParClauARPC.es:rings