Design, synthesis, and biological evaluation of 2-hydroxy-4-phenylthiophene-3-carbonitrile as PD-L1 antagonist and its comparison to available small molecular PD-L1 inhibitors by Ważyńska, MA, Butera, R, Requesens, M, Plat, A, Zarganis-Tzitzikas, T, Neochoritis, CG, Plewka, J, Skalniak, L, Kocik-Krol, J, Musielak, B, Magiera-Mularz, K, Rodriguez, I, Blok, SN, de Bruyn, M, Nijman, HW, Elsinga, PH, Holak, TA, Dömling, A