12568
Both silathio / silasulfonyl acetic acids were efficiently condensed with benzohydrazides in the presence of phosphorus oxychloride to give sila - substituted 1 , 3 , 4 - oxadiazoles in high yields .
 Chemical: silathio / silasulfonyl acetic acids; Chemical: benzohydrazides; Chemical: phosphorus oxychloride; Chemical: sila - substituted 1 , 3 , 4 - oxadiazoles
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: silathio / silasulfonyl acetic acids; Chemical: benzohydrazides; Chemical: phosphorus oxychloride; Chemical: sila - substituted 1 , 3 , 4 - oxadiazoles