29080
Polymorphism in porphyrin monolayers : the relation between adsorption configuration and molecular conformation .
 Chemical: porphyrin
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: porphyrin 
Answer:
 Chemical: porphyrin