19177
Four new 4 - hydroxy - 2 - pyridone alkaloids , didymellamides A - D ( 1 - 4 ) , were isolated from the marine - derived fungus Stagonosporopsis cucurbitacearum .
 Chemical: 4 - hydroxy - 2 - pyridone alkaloids; Chemical: didymellamides A - D
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: 4 - hydroxy - 2 - pyridone alkaloids; Chemical: didymellamides A - D