17886
Compound 4 proved to be a versatile compound for the synthesis of several Indenopyrazolopyrazinone derivatives .
 Chemical: Indenopyrazolopyrazinone
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: Indenopyrazolopyrazinone