1910
A green and simple approach to assembling of 2 - amino - 4 , 8 - dihydropyrano [ 3 , 2 - b ] pyran - 3 - carbonitrile scaffolds via three - component reaction of kojic acid , malononitrile , and aromatic aldehydes in aqueous media under ultrasound irradiation is described .
 Chemical: 2 - amino - 4 , 8 - dihydropyrano [ 3 , 2 - b ] pyran - 3 - carbonitrile; Chemical: kojic acid; Chemical: malononitrile; Chemical: aromatic aldehydes
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 2 - amino - 4 , 8 - dihydropyrano [ 3 , 2 - b ] pyran - 3 - carbonitrile; Chemical: kojic acid; Chemical: malononitrile; Chemical: aromatic aldehydes