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Here , we report isolation of kahalalide Y ( 1 ) from Bryopsis pennata for the first time ; in addition , the application of a combination of molecular modeling and NOE distance constraint calculations was utilized to determine the conformation of 1 and the absolute configuration of the final stereogenic center of 1 .
 Chemical: kahalalide Y
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: kahalalide Y