12520
The majority of these heterocycles can be prepared from three common corresponding starting materials : the corresponding anilines , isatins or anthranilic esters .
 Chemical: anilines; Chemical: isatins; Chemical: anthranilic esters
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: anilines; Chemical: isatins; Chemical: anthranilic esters