30371
The compound with the most potent neuroprotective action was N - { 3 - [ 2 - ( 4 - phenyl - piperazin - 1 - yl ) - ethyl ] - phenyl } - picolinamide ( 6b ) , which reduced 6 - OHDA - induced apoptotic death through stabilization of mitochondrial membrane and subsequent prevention of superoxide production , caspase activation and DNA fragmentation .
 Chemical: N - { 3 - [ 2 - ( 4 - phenyl - piperazin - 1 - yl ) - ethyl ] - phenyl } - picolinamide; Chemical: 6 - OHDA; Chemical: superoxide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: N - { 3 - [ 2 - ( 4 - phenyl - piperazin - 1 - yl ) - ethyl ] - phenyl } - picolinamide; Chemical: 6 - OHDA; Chemical: superoxide