17005
It has been shown to be at least tenfold more potent than combretastatin A4 ( CA4 ) in terms of vascular shutdown , which correlates with its metabolism to reactive ortho - quinone species that are assumed to be directly cytotoxic in tumor cells .
 Chemical: combretastatin A4; Chemical: CA4; Chemical: ortho - quinone
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: combretastatin A4; Chemical: CA4; Chemical: ortho - quinone