(1R, 2R)-1,2-Bis(2-hydroxyphenyl)ethylenediamine or (R, R)-1,2-bis(2-hydroxyphenyl)-1,2-diaminoethane (HPEN) is commonly used in the stereoselective synthesis of enantiopure compounds. Synonyms: (1R,2R)-1,2-Bis(2-hydroxyphenyl)-1,2-ethanediamine; (R,R) Diaminopharm Diamine; (R,R) Jik Chin…