3083
Moreover , in vivo study showed accumulation of more Pt species in the tumor site and lower systematic toxicity compared to free cisplatin ( II ) and cisplatin ( IV ) .
 cisplatin ( II ), cisplatin ( IV )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 cisplatin ( II ), cisplatin ( IV )