20802
A seven - point pharmacophore model with one hydrophobic group ( H ) , two hydrogen bond donors ( D ) and four aromatic rings ( R ) was developed using phase ( pharmacophore alignment & scoring engine ) .
 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