Withanolides, a new class of natural cholinesterase inhibitors with calcium antagonistic properties - Choudhary, M I; Nawaz, S A; ul-Haq, Z; Lodhi, M A; Ghayur, M N; Jalil, S; Riaz, N; Yousuf, S; Malik, A; Gilani, A H; ur-Rahman, A (Biochem Biophys Res Commun, 2005)