30376
The cytoprotective effect of 6b was also observed in 6 - OHDA - treated neuronal PC12 cells , but not in SH - SY5Y or PC12 cells exposed to 1 - methyl - 4 - phenylpyridinium , indicating that the observed neuroprotection was dependent on the cytotoxic stimulus .
 Chemical: 6 - OHDA; Chemical: 1 - methyl - 4 - phenylpyridinium
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: 6 - OHDA; Chemical: 1 - methyl - 4 - phenylpyridinium