19927
A new series of 2 - heteroarylthio - 6 - substituted - quinazolin - 4 - one analogs was designed , synthesized , and evaluated for their in vitro DHFR inhibition , antimicrobial , and antitumor activities .
 Chemical: 2 - heteroarylthio - 6 - substituted - quinazolin - 4 - one
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: 2 - heteroarylthio - 6 - substituted - quinazolin - 4 - one