12899
The aglycon side chain is responsible for an interaction with the DNA - phosphate backbone as mithramycin interacts with its target DNA .
 Chemical: phosphate; Chemical: mithramycin
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: phosphate; Chemical: mithramycin