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Mass spectrometry analysis of aging in either H ( 2 ) ( 16 ) O or H ( 2 ) ( 18 ) O furthermore allowed us to identify the inhibition steps , in which water molecules are involved , thus providing insights into the mechanistic details of inhibition .
 Chemical: H ( 2 ) ( 16 ) O; Chemical: H ( 2 ) ( 18 ) O
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: H ( 2 ) ( 16 ) O; Chemical: H ( 2 ) ( 18 ) O