1,4-Dioxane-2,5-dione, 3,6-dimethyl-, (3R,6S)-rel-, polymer with (3S,6S)-3,6-dimethyl-1,4-dioxane-2,5-dione 1,4-Dioxane-2,5-dione, 3,6-dimethyl-, (3S-cis)-, polymer with trans-3,6-dimethyl-1,4-dioxane-2,5-dione 1,4-Dioxane-2,5-dione, 3,6-dimethyl-, (3S,6S)-, polymer with rel-(3R,6S)-3,6-dimethyl-1,4-dioxane-2,5-dione 1,4-Dioxane-2,5-dione, 3,6-dimethyl-, trans-, polymer with (3S-cis)-3,6-dimethyl-1,4-dioxane-2,5-dione DL-Lactide copolymer L-Lactide-meso-lactide copolymer