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This work studied the neurotoxicity of MDMA and its catechol metabolites , alpha - methyldopamine ( alpha - MeDA ) and N - methyl - alpha - methyldopamine ( N - Me - alpha - MeDA ) in human dopaminergic SH - SY5Y cells differentiated with retinoic acid and 12 - O - tetradecanoyl - phorbol - 13 - acetate .
 MDMA, catechol, alpha - methyldopamine, alpha - MeDA, N - methyl - alpha - methyldopamine, N - Me - alpha - MeDA, retinoic acid, 12 - O - tetradecanoyl - phorbol - 13 - acetate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 MDMA, catechol, alpha - methyldopamine, alpha - MeDA, N - methyl - alpha - methyldopamine, N - Me - alpha - MeDA, retinoic acid, 12 - O - tetradecanoyl - phorbol - 13 - acetate