Disclosed is a method for preparing a prostaglandin derivative of formula :which comprises reacting an aldehyde represented by formula :with a 2-oxoalkyl phosphonate in a reaction solvent under the presence of alkali hydroxide as sole base. The fixed visible input and the tunable visible inputs are aligned so that their surface locations of optical illumination overlap on the interrogated location. A gate line inactivation transition detecting circuit detects inactivation of each of a plurality of gate lines and activates a detect signal for a certain period with that timing. The dispersion medium comprises an acid solution the pH of which is equal to or less than 4. The electronic device and the method of operating the electronic device may effectively form a connection between two or more electronic devices by allowing a relaying device to transfer connection information between the electronic devices to a counterpart.