26245
A preactivation step followed , mediated by 6 , 6 ' dithionicotinamide , thiol groups were modified by disulfide bonds formation .
 Chemical: 6 , 6 ' dithionicotinamide; Chemical: thiol; Chemical: disulfide
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: 6 , 6 ' dithionicotinamide; Chemical: thiol; Chemical: disulfide