22709
A novel series of compounds were synthesized by cyclic condensation reaction of substituted isothiocyanate ( 2a - c ) with 2 - thiophenecarboxylic acid hydrazide ( 1 ) in the presence of ethyl alcohol , to obtain intermediate thiosemicarbazides ( 3a - c ) , which were further treated with sodium hydroxide in the presence of ethanol to obtain triazole derivatives ( 4a - c ) .
 Chemical: isothiocyanate; Chemical: 2 - thiophenecarboxylic acid hydrazide; Chemical: ethyl alcohol; Chemical: thiosemicarbazides; Chemical: sodium hydroxide; Chemical: ethanol; Chemical: triazole
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: isothiocyanate; Chemical: 2 - thiophenecarboxylic acid hydrazide; Chemical: ethyl alcohol; Chemical: thiosemicarbazides; Chemical: sodium hydroxide; Chemical: ethanol; Chemical: triazole