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We describe complexes of ruthenium and europium with rigid , 5 ' - 6 - locked 1 , 10 - phenanthroline - containing nucleosides .
 Chemical: ruthenium; Chemical: europium; Chemical: 1 , 10 - phenanthroline; Chemical: nucleosides
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: ruthenium, europium, 1 , 10 - phenanthroline, nucleosides 
Answer:
 Chemical: ruthenium; Chemical: europium; Chemical: 1 , 10 - phenanthroline; Chemical: nucleosides