6333
We studied the orientations and magnitudes of the electric dipole transition moments ( EDTMs ) of 6 - methyl isoxanthopterin ( 6 - MI ) , a fluorescent analogue of guanine that has been particularly useful in biological studies .
 Chemical: 6 - methyl isoxanthopterin; Chemical: 6 - MI; Chemical: guanine
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: 6 - methyl isoxanthopterin; Chemical: 6 - MI; Chemical: guanine