1263
The ground electronic states of several ( GtK + 2H ) ( + * ) , ( AtK + 2H ) ( + * ) , and ( AtR + 2H ) ( + * ) conformers were explored by extensive ab initio and density functional theory calculations of the potential energy surface .
 Chemical: GtK; Chemical: 2H; Chemical: AtK; Chemical: 2H; Chemical: AtR; Chemical: 2H
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: GtK; Chemical: 2H; Chemical: AtK; Chemical: 2H; Chemical: AtR; Chemical: 2H