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 .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None