Forigerimod (IPP-201101), a potent CD4 T-cell modulator, is a 21-amino-acid fragment of the U1 small nuclear ribonucleoprotein 70 kDa, phosphorylated at Ser140, known for its ability to inhibit autophagy effectively. It has applications in researching autoimmune disorders, including systemic lupus erythematosus (SLE) [1] [2] [3] [4].