L-Glutamic acid, 5-methyl ester, polymer with 5-octadecyl hydrogen L-glutamate L-Glutamic acid, 5-octadecyl ester, polymer with 5-methyl hydrogen L-glutamate Methyl L-glutamate-octadecyl L-glutamate copolymer Poly[(γ-methyl L-glutamate)-co-(γ-octadecyl L-glutamate)] γ-Methyl L-glutamate-γ-octadecyl L-glutamate copolymer γ-Methyl-L-glutamate-γ-stearyl-L-glutamate copolymer