25573
An interesting system of intramolecular hydrogen bonds and weak intermolecular CH ... O type hydrogen bond was observed in the solid state .
 Chemical: hydrogen; Chemical: CH; Chemical: O; Chemical: hydrogen
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: hydrogen; Chemical: CH; Chemical: O; Chemical: hydrogen