23614
Whereas the halogens do not alter the preferential formation of Watson - Crick geometries , self - associates of the halouracils point to a more favorable engagement of the 2 - carbonyl as proton acceptor in the cyclic hydrogen bonds , suggesting increased formation of reverse geometries and wobble base pairs with guanine when compared to the thymine base .
 Chemical: halogens; Chemical: halouracils; Chemical: 2 - carbonyl; Chemical: hydrogen; Chemical: guanine; Chemical: thymine
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: halogens, halouracils, 2 - carbonyl, hydrogen, guanine, thymine 
Answer:
 Chemical: halogens; Chemical: halouracils; Chemical: 2 - carbonyl; Chemical: hydrogen; Chemical: guanine; Chemical: thymine