Forigerimod TFA (IPP-201101 TFA), a CD4 T-cell modulator, is a phosphorylated 21-amino-acid fragment derived from U1 small nuclear ribonucleoprotein 70 kDa, specifically at Ser140. It notably inhibits autophagy and is utilized in researching autoimmune disorders, including systemic lupus erythematosus (SLE) [1] [2] [3] [4].