Synthesis of a Precursor of Bioactive Pentapeptide OGP-(10-14) and the Fragment of Enkephalin Catalyzed by MCM-22 Immobilized or Free Proteases in Organic Solvents - Liu, Ping; Ye, Yun-hua; Tian, Gui-ling; Lee, Kin-Sing; Wong, Man-Sau; Lo, Wai-hung (Synthesis, 2002)