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GHRP - 6 was quantified in human plasma by a specific LC - MS method , previously developed and validated following FDA guidelines , using ( 13 ) C ( 3 ) Ala - GHRP - 6 as internal standard ( Gil et al . , 2012 , J . Pharm . Biomed . Anal . 60 , 19 - 25 ) .
 Chemical: GHRP - 6; Chemical: ( 13 ) C ( 3 ) Ala - GHRP - 6
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: GHRP - 6; Chemical: ( 13 ) C ( 3 ) Ala - GHRP - 6