Photoresist Chemicals L-Serine, L-threonyl-L-tyrosyl-L-arginyl-L-leucyl-L-lysyl-L-leucyl-L-tyrosyl-L-seryl-L-leuc yl-L-arginyl-L-tryptophyl-L-isoleucyl- Cas：923003-21-8 Molecular Formula：C81H127N21O19