Disclosed are compounds or pharmaceutically acceptable salts thereof, having the structure of formula I. Shoulders on the body portion and the handle portion limit relative sliding movement of the body portion and handle portion. Such enhanced desorption is particularly useful in fields of analysis such as mass spectrometry. In a simulator apparatus, a first analysis unit analyzes hemodynamics in the first vessels, based on the geometric model and first vessel network model of the organ and reflecting the motion of the organ. The application policy defines at least one of a SIP message header field to include, a SIP message header field to remove, a SIP message header field to allow, and a SIP message header field to modify. A process for preparing the compound is also provided wherein bathophenanthroline and an organolithium compound are subjected to nucleophilic substitution reaction to obtain the compound of the above formula I or II.