Katalytic Therapeutics Inc. has divulged proteolysis targeting chimera (PROTAC) compounds comprising an E3 ubiquitin ligase binding moiety covalently linked to a phosphodiesterase PDE4-targeting moiety reported to be useful for the treatment of arthritis, Behçet’s disease, chronic obstructive pulmonary disease, non-small-cell lung cancer, inflammatory disorders, inflammatory bowel disease, psoriasis and rheumatoid arthritis.