17168
In an effort to prepare a fluorogenic substrate to be used in activity assays with metallo - beta - lactamases , ( 6R , 7R ) - 8 - oxo - 7 - ( 2 - oxo - 2H - chromene - 3 - carboxamido ) - 3 - ( ( 4 - ( 2 - oxo - 2H - chromene - 3 - carboxamido ) - phenylthio ) methyl ) - 5 - thia - 1 - azabicyclo [ 4 . 2 . 0 ] oct - 2 - ene - 2 - carboxylic acid ( CA ) was synthesized and characterized .
 Chemical: ( 6R , 7R ) - 8 - oxo - 7 - ( 2 - oxo - 2H - chromene - 3 - carboxamido ) - 3 - ( ( 4 - ( 2 - oxo - 2H - chromene - 3 - carboxamido ) - phenylthio ) methyl ) - 5 - thia - 1 - azabicyclo [ 4 . 2 . 0 ] oct - 2 - ene - 2 - carboxylic acid
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: ( 6R , 7R ) - 8 - oxo - 7 - ( 2 - oxo - 2H - chromene - 3 - carboxamido ) - 3 - ( ( 4 - ( 2 - oxo - 2H - chromene - 3 - carboxamido ) - phenylthio ) methyl ) - 5 - thia - 1 - azabicyclo [ 4 . 2 . 0 ] oct - 2 - ene - 2 - carboxylic acid