Photoresist Chemicals TIANFUCHEM-L-Cysteine, L-phenylalanyl-L-valyl-L-phenylalanyl-L-prolyl-L-threonyl-L-lysyl-L-a-aspartyl -L-valyl-L-alanyl-L-leucyl-L-arginyl-L-histidyl-L-valyl-L-valyl- Cas:594830-40-7 Molecular Formula:C81H127N21O19S