17679
Compound 1 showed potent inhibitory activity against vascular endothelial growth factor receptor ( VEGFR ) tyrosine kinases in in vitro enzyme assays , but platelet - derived growth factor receptors ( PDGFRs ) , fibroblast growth factor receptor ( FGFR ) , and epidermal growth factor receptor ( EGFR ) responded only weakly .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None