An aromatic compound of the following formula, , or. The tunnel is composed of a bottom portion and alternating top portions that are alternatively and selectively secured to the bottom portion. The connector key can include a top central depression, side walls having top gaps, side shoulders having channels and recesses, all providing opportunity for sealant to flow from the central depression over the side regions of the connector key. The multiple first terminals are disposed on the inner surface of the housing and electrically connected with the flexible battery. The first Interim Connection Space is decomposed into orthogonal subspaces, the orthogonal subspaces including a first subspace that is a null space of the second map and a second subspace that is an orthogonal complement of the null space in the first Interim Connection Space. The bottom surface wall of the base body has an inclined plane that is inclined in relation to a horizontal plane.