20702
In this study , we investigate the effect of the electrophiles and the nucleophiles for eight catalysts in the catalytic SN 1 type substitution of alcohols with different degree of activation by sulfur - , carbon - , oxygen - , and nitrogen - centered nucleophiles .
 Chemical: alcohols; Chemical: sulfur; Chemical: carbon; Chemical: oxygen; Chemical: nitrogen
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: alcohols; Chemical: sulfur; Chemical: carbon; Chemical: oxygen; Chemical: nitrogen