The present invention relates to novel derivatives of glycyrrhetinic acid, compositions comprising said derivatives and their use in the treatment of conditions or diseases that benefit from an upregulation of PPAR&ggr; andor a downregulation of the expression or activity of one or more specificity proteins, such as cancer, diabetes and Huntington’s disease. The ceiling panel structure is adapted to be mounted on the ceiling surface at an outside of the air-conditioning apparatus and has a deflection induction portion substantially rigid against the airflow to deflect a part of the conditioning air, having been blown out through the air-outlet of the air-conditioning apparatus, back to the room air-inlet. A plurality of growing panels and a plurality of lighting fixtures are slidably mounted on a grow system support structure positioned within the grow enclosure.