18880
Orally bioavailable and brain - penetrant pyridazine and pyridine - derived gamma - secretase modulators reduced amyloidogenic A beta peptides in vivo .
 Chemical: pyridazine; Chemical: pyridine
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: pyridazine; Chemical: pyridine