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It was further reacted with cyanamide to afford the corresponding cyanamine ( 4 ) , which was subsequently reacted with different heterocyclic amines to form the title compounds ( 5a - l ) .
 Chemical: cyanamide; Chemical: cyanamine; Chemical: heterocyclic amines
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: cyanamide; Chemical: cyanamine; Chemical: heterocyclic amines