5336
The results indicate that the preferential orientations of H ( 2 ) in the defect - free ( i . e . , no C vacancy ) C ( 60 ) TiH ( 2 ) complex are along the x - and y - axes of C ( 60 ) ( with adsorption energies of - 0 . 23 and - 0 . 21 eV , respectively ) , making these orientations the most suitable ones for hydrogen storage , in contrast to the results obtained for defect - containing fullerenes .
 Chemical: H ( 2 ); Chemical: C; Chemical: C ( 60 ) TiH ( 2 ); Chemical: C ( 60 ); Chemical: hydrogen
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: H ( 2 ); Chemical: C; Chemical: C ( 60 ) TiH ( 2 ); Chemical: C ( 60 ); Chemical: hydrogen