18271
The aggregation and solubilization of four structurally related meso - tetraphenyl porphyrin photosensitizers with nonionic ( 4 - hydroxy ) , anionic ( 4 - sulphonate ; 4 - carboxy ) and cationic ( 4 - trimethylanilinium ) substituents were evaluated in various vehicles by use of UV - Vis spectroscopy .
 Chemical: meso - tetraphenyl porphyrin; Chemical: 4 - hydroxy; Chemical: 4 - sulphonate; Chemical: 4 - carboxy; Chemical: 4 - trimethylanilinium
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 - tetraphenyl porphyrin; Chemical: 4 - hydroxy; Chemical: 4 - sulphonate; Chemical: 4 - carboxy; Chemical: 4 - trimethylanilinium