α-Glucosidase inhibition of lactone intermediates of the iminosugar deoxynojirimycin by Wai Haan, Y, Al-Bajalan, H, Eukun Sage, E, Elangovan, D, Liana Mat Yajit, N, Maisarah Sarizan, N, Zitzmann, N, Kiappes, J, Aishah Hasbullah, S, Hadiani Ismail, N, Mohamed Mackeen, M