This application provides an H2S scrubbing system, a column packed with an inert material, wherein an inert gas passes counter to a flow of a hydrotreated product containing H2S through said column. The structure comprises deep trench metal electrodes between which electroluminescent material is disposed on the sidewalls of the electrodes, forming a series of luminescent diode elements stacked horizontally on a substrate. The autonomous vehicle operates within a working area and comprises a receiver for detecting the at least one signal emitted by the emitter, and a processor for determining a relative location of the autonomous vehicle within the working area based on the signal emitted by the emitter. A joining pipe is connected to the first and second draining pipes at a joining point. The object was attained by formulating a prostaglandin F2\u03b1 derivative into an oil-in-water emulsion together with an oil, for example, medium chain fatty acid triglyceride, a water-soluble polymer and water. The clips can be coated with drugs or a radiopaque coating.