3771
Recent studies propose that N - arachidonyl glycine ( NAGly ) , a carboxylic analogue of anandamide , is an endogenous ligand of the G alpha ( i / o ) protein - coupled receptor 18 ( GPR18 ) .
 Chemical: N - arachidonyl glycine; Chemical: NAGly; Chemical: carboxylic; Chemical: anandamide
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: N - arachidonyl glycine; Chemical: NAGly; Chemical: carboxylic; Chemical: anandamide