20829
The supercritical CO2 extract from leaves was purified by chromatographic methods , yielding compounds ( 1 ) , ( 4 ) and ( 7 ) , which were identified by ( 1 ) H NMR and comparison with literature data .
 Chemical: CO2; Chemical: ( 1 ) H
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: CO2; Chemical: ( 1 ) H