29800
New pi - extended porphyrin dyes with long alkoxyl chains at the ortho positions of the meso - phenyls , and meta di - tert - butylphenyl - substituted porphyrins , and were synthesized for dye - sensitized solar cells , and their optical , electrochemical and photovoltaic properties were investigated and compared with those of and .
 porphyrin, meso - phenyls, meta di - tert - butylphenyl - substituted porphyrins
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 porphyrin, meso - phenyls, meta di - tert - butylphenyl - substituted porphyrins