21192
Acid dissociation constants ( pKa ) were determined , the effect of functional surfactant alkyl chain length and pH on the observed rate constant ( kobs ) for phosphate ester cleavage has been discussed , and the effect of substrate on the supernucleophilicities of the studied oximes was monitored .
 Chemical: alkyl; Chemical: phosphate ester; Chemical: oximes
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: alkyl, phosphate ester, oximes 
Answer:
 Chemical: alkyl; Chemical: phosphate ester; Chemical: oximes