19801
Tumor delivery of Photofrin (R) by PLL - g - PEG for photodynamic therapy .
 Chemical: Photofrin; Chemical: PLL - g - PEG
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: Photofrin; Chemical: PLL - g - PEG