5412
The CaCO ( 3 ) formulation provided a stable pH - environment , optimally suited for pH - sensitive proteins .
 Chemical: CaCO ( 3 )
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: CaCO ( 3 )