29081
Self - assembled monolayers of meso - 5 , 10 , 15 , 20 - tetrakis ( undecyl ) porphyrin copper ( ii ) on a graphite / 1 - octanoic acid interface have been studied by Scanning Tunnelling Microscopy .
 Chemical: meso - 5 , 10 , 15 , 20 - tetrakis ( undecyl ) porphyrin copper ( ii ); Chemical: graphite; Chemical: 1 - octanoic acid
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: meso - 5 , 10 , 15 , 20 - tetrakis ( undecyl ) porphyrin copper ( ii ); Chemical: graphite; Chemical: 1 - octanoic acid