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Single molecule conductance measurements on alkanedithiols and alkoxydithiols ( dithiolated oligoethers ) were performed using the STM - controlled break junction method in order to ascertain how the oxygen heteroatoms in saturated linear chains impact the molecular conductance .
 Chemical: alkanedithiols; Chemical: alkoxydithiols; Chemical: dithiolated oligoethers; Chemical: oxygen
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: alkanedithiols; Chemical: alkoxydithiols; Chemical: dithiolated oligoethers; Chemical: oxygen