19131
The inferred pathway was genetically refactored in a heterologous host , Streptomyces coelicolor CH999 , to produce 3 mg / L A - 74528 in the absence of fredericamycin .
 A - 74528, fredericamycin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 A - 74528, fredericamycin