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Macroscopic images of films: (a) CS-S1 (chitosan-sulfametoxydiazine); (b) CS-S2 (chitosan-sulfadiazine); (c) CS-S3 (chitosan-sulfadimethoxine); (d) CS-S4 (chitosan-sulfamethoxazol); (e) CS-S5 (chitosan-sulfamerazine); and (f) CS-S6 (chitosan-sulfizoxazol).
