D,L-Lactic acid-(ethylene oxide block copolymer D,L-Lactic acid-polyethylene glycol monomethyl ether diblock copolymer Ethylene glycol methyl ether-lactide-lysine copolymer Ethylene oxide-DL-Lactic acid diblock copolymer methyl ether Ethylene oxide-lactic acid diblock copolymer methyl ether Lactic acid-ethylene oxide block copolymer methyl ether Lactic acid-oxirane diblock copolymer monomethyl ether MPEG-PLA Oxirane-L-lactide diblock copolymer monomethyl ether Propanoic acid, 2-hydroxy-, polymer with oxirane, monomethyl ether, diblock