Aktivitas Penghambatan DPP-4 Ekstrak Ionic Liquid 1-butyl-3- methylimidazolium methylsulfate (Bmim[MeSO4]) - MAE Kulit Batang Murbei Putih (Morus alba) = Inhibition Activity of DPP-4 Ionic Liquid 1-butyl-3- methylimidazolium methylsulfate (Bmim [MeSO4]) - MAE Extract from Stem Bark of White Mulberry (Morus alba)