17949
Studies of human renal histopathology and clinical diagnoses indicated that melamine - related obstructive nephropathy derives from melamine precipitation in the lower urinary tract , with stones that are thought to be melamine - uric acid complexes .
 Chemical: melamine; Chemical: melamine; Chemical: melamine; Chemical: uric acid
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: melamine; Chemical: melamine; Chemical: melamine; Chemical: uric acid