27498-47-1 31325-39-0 L-Glutamic acid, polymer with L-tyrosine L-Glutamic acid-L-tyrosine copolymer Poly(E,Y)1-4 Poly(L-glutamyl-L-tyrosine) Poly(glu(50)tyr(50)) Poly(glu(80)tyr(20)) Poly(glu-tyr)(4:1)