This invention relates to compounds useful as ionic liquids that are based on an N-substituted pyrrolidinone and incorporate a pendant ammonium cation that is spaced from the pyrrolidone ring by a variable length linker. This disclosure also encompasses homologues of the edr3 gene from mammals, in particular from humans. A positioning surface with which an end surface of the cable sheath can come in contact is provided at the boundary between the fiber receiving groove and the cable receiving part. The second pipe is connected to the two cylinders to be moved up and down vertically while surrounding the first pipe by an advance and retreat of the second cylinder unit.