A door lock with a bolt, wherein the bolt pieces of the dual-action bolt are prevented from turning away from each other as the bolt pieces have two projections arranged to cooperate with the inner surface of the front plate. The range \u201cL2\u201d is a range such that L2\u22670. The monitoring apparatus has a first interface for receiving identification data from an identification system. The connecting member passes through the first slot and the second slot and connects the rail and the slide bar. The precipitate is eliminated by filtration to provide a solution from which practically tautomer-free cefotetan is obtained.