When manufacturing a recording medium, a material layer 12 formed on a substrate 11 that composes the recording medium is exposed to a laser beam in accordance with a recording pattern. The compounds of formula I are muscarinic receptor antagonists. The near and bearing far ends are each connected to a taper seal portion, which in turn communicates with the atmosphere. The user secret key is a set of values in a vector that are chosen to satisfy a reconstruction function for reconstructing the random vector using the first set of lattices.