25002
More generally , our proposed mechanism for the reactivity of the gold / TiO2 interface should hold for oxidation of organic molecules with the structure of R - O - R ' , where R and R ' are ( saturated ) hydrocarbons .
 Chemical: TiO2; Chemical: R - O - R '; Chemical: ( saturated ) hydrocarbons
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: TiO2; Chemical: R - O - R '; Chemical: ( saturated ) hydrocarbons