11784
Structure analysis of the isolated OKA analogue 19 - epi - OKA showed important conformation differences expected to result in lower protein phosphatase ( PP ) inhibitory potencies than OKA .
 Chemical: OKA; Chemical: 19 - epi - OKA; Chemical: OKA
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: OKA; Chemical: 19 - epi - OKA; Chemical: OKA