Synfacts, Table of Contents Synfacts 2019; 15(01): 0033DOI: 10.1055/s-0037-1611452 Synthesis of Materials and Unnatural Products © Georg Thieme Verlag Stuttgart · New YorkEndo, Exo, and What?Contributor(s): Timothy M. Swager , Samuel I. EtkindRecommend Article Abstract Key words Key wordsthiopyrans - polycycles - cycloaromatization Full Text