fletikumab fletikumab fletikumab (nnc0109-0012) (inn) is a monoclonal antibody designed for the treatment of rheumatoid arthritis that targets il-20. fletikumabmonoclonal antibodytype?targetil20clinical dataother namesnnc0109-0012atc codenoneidentifierscas number1357158-22-5chemspidernoneunii82wg3pol9wkeggd11756chemblchembl3301580chemical and physical dataformulac6494h10000n1728o2050s44molar mass146492.12 g·mol−1 this drug was being developed by novo nordisk a/s until novo ceased work in inflammation.