6897
Both dihydropyridazinone rings , in the core and extension , can be replaced by achiral 4 , 4 - dimethylpyrazolone subunits and the core pyrazolopyridine by isosteric bicyclic heteroaromatics .
 Chemical: dihydropyridazinone; Chemical: 4 , 4 - dimethylpyrazolone; Chemical: pyrazolopyridine
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: dihydropyridazinone; Chemical: 4 , 4 - dimethylpyrazolone; Chemical: pyrazolopyridine