The present invention relates to compounds of formula I: 1or pharmaceutically acceptable salt forms or prodrugs thereof, which are useful as inhibitors of HIV protease, and to pharmaceutical compositions and diagnostic kits comprising the same, and methods of using the same for treating viral infection or as an assay standard or reagent. A cell region is disposed in a substrate. The leadframe comprises a plurality of bond pads that are exposed at a bottom surface of the leadframe and a plurality of traces that are exposed at the bottom surface of the leadframe. The closed conductor loop has a first coupling conductor portion and a second coupling conductor portion, and the closed conductor loop has a plurality of bending portions to form a three-dimensional structure, and a first coupling gap is formed between the first and the second coupling conductor portions.