A compound, suitable as an alpha-2B-adrenoceptor antagoist, having a structure of formula . A scheduling system for scheduling procedures in a clinical environment includes historical procedure data including stored duration values for a procedure. A sampled packet identification is compared to record identifications in a table of identifications. Acoustically absorptive, reflective, and diffusive components can be used in combinations with each other in order to achieve desired acoustic treatment of the building feature.