6233
Rigid 5 ' - 6 - locked phenanthroline - derived nucleosides chelated to ruthenium and europium ions .
 Chemical: phenanthroline; Chemical: nucleosides; Chemical: ruthenium; Chemical: europium
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: phenanthroline, nucleosides, ruthenium, europium 
Answer:
 Chemical: phenanthroline; Chemical: nucleosides; Chemical: ruthenium; Chemical: europium