14868
Organometallic half - sandwich complexes [ M ( p - cymene ) ( azo / imino - pyridine ) X ] ( + ) where M = Ru ( II ) or Os ( II ) and X = Cl or I , exhibit potent antiproliferative activity toward a range of cancer cells .
 Chemical: [ M ( p - cymene ) ( azo / imino - pyridine ) X ] ( + ); Chemical: M = Ru ( II ) or Os ( II ); Chemical: X = Cl or I
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: [ M ( p - cymene ) ( azo / imino - pyridine ) X ] ( + ); Chemical: M = Ru ( II ) or Os ( II ); Chemical: X = Cl or I