L-Carvone, chitosan (medium viscous, 200~400 mPa·s), and aryl aldehydes were purchased from Energy Chemical (Shanghai, China). 4-Methyl-thiosemicarbazide was provided by TCI (Tokyo, Japan). Ethyl bromoacetate, 5-amino-1,3,4-thiadiazole-2-thiol, chloroacetyl chloride, and other reagents/solvents were obtained from Macklin (Shanghai, China).
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