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Using this approach , we demonstrate that for all bases except guanine , the lowest electron detachment energy corresponds to detachment from the sugar - phosphate backbone and allows us to determine the lowest adiabatic ionization energy for the other three bases for the first time in an isolated nucleotide .
 Chemical: guanine; Chemical: sugar; Chemical: phosphate; Chemical: nucleotide
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: guanine; Chemical: sugar; Chemical: phosphate; Chemical: nucleotide