def METHOD_NAME():
    global mol
    mol = gto.Mole()
    mol.build(
        verbose = 0,
        atom = [
        ["O" , (0. , 0.     , 0.)],
        [1   , (0. , -0.757 , 0.587)],
        [1   , (0. , 0.757  , 0.587)] ],
        basis = 'cc-pvdz',
    )